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Hyperbolic Sports

Sport in Hyperbolic Space
Imagining a world of playing baseball and golf with hyperbolic geometry, rather than Euclidean.
Featuring Dick Canary

Billionaire
James H Simons
He became one of the world's richest men using mathematics - now he gives money back to math and science.
Featuring Jim Simons
Coconuts
Monkeys and Coconuts
A puzzle that stumpedmany people - prepare for 'negative coconuts'. Animation by Pete McPartlan.
Featuring Tony Padilla
Everything Formula
Tupper's Self-Referential Formula
A formula which plots itself... and everything else.
Featuring Matt Parker
Birthday Problem
Cheryl's Birthday Problem
A math-logic problem from Singapore which went viral.
Featuring Simon Pampena
Telescope Allocation
Telescope Time
An astronomy/math collaboration in search of a fairer system for allocating telescopes.
Featuring Mike Merrifield
Relationship
Relationship Equation
Can mathematics be used to describe and predict the future of relationships?
Featuring Hannah Fry
5th Axiom
Ditching the Fifth Axiom
Doing away with Euclid's fifth axiom led to the birth of Hyperbolic Geometry.
Featuring Caleb Ashley
52 card Perfect Shuffle
52-card Perfect Shuffles
Perfect shuffles and a nifty card trick.
Featuring Jason Davison
7 Shuffles
How to Shuffle
What oi f the best way to shuffle cards. Riffle shuffles vs Overhand.
Featuring Persi Diaconis
Shuffle Trick
Looking at Shuffling
How do cards move through a shuffled deck?
Featuring Federico Ardila
1 to 200 Google Images
1 to 200 on Google Images
A fun look at Google Image search results for numbers 1 to 200.
Featuring music by Alan Stewart
Bridge to Fermat
Bridge to Fermat
There was more to cracking Fermat's Last Theorem than Andrew Wiles' extraordnary proof.
Featuring Ken Ribet
58
58 and Lingusitics
How various other languges handle numbers, from Danish to Klingon.
Featuring Tom Scott
Useless
Useless Imaginary Numbers
The first people to stumble over imaginary numbers (namely the square root of -15) thought it was "subtle" and "useless".
Featuring Barry Mazur
Little Professor
Little Professor Toy
The Texas Instruments Little Professor - a love letter from Dr Grime.
Featuring James Grime
Little Professor Unboxing
Little Professor Unboxing
Putting the Little Professor through its paces.
Featuring Matt Parker
Super Egg
Super Egg
Super ellipses and and super eggs - and traffic managemnet in Stockholm.
Featuring Alex Bellos
Coin Catch
Should you catch a coin
Is it more random to toss a coin or spin in on table? And if you flip it, should you catch it?
Featuring Persi Diaconis
Coin Flip
How random is a coin toss?
Is flipping a coin - head or tails - really a 50/50 prospect?
Featuring Persi Diaconis
Rock Paper Scissors
Rock Paper Scissors
A little mathematics behind this famous and seemingly simply game. What is the best strategy?
Featuring Hannah Fry
Rock Paper Lizards
Rock Paper Lizards
Some extra stuff on rock paper scissors - including how it applies to the animal kingdom.
Featuring Hannah Fry
Lucas-Carmichael Numbers
Lucas-Carmichael Numbers
399 and 2015 are among this unusual classification of numbers?
Featuring Ed Copeland
17-gon
Heptadecagon
The 17-gon is part of an amazing story about Gauss. And led to the address 17 Gauss Way for MSRI!
Featuring David Eisenbud
Dots and Boxes
Dots and Boxes
Game theory legend Elwyn Berlekamp on how to always win at Dots and Boxes.
Featuring Elwyn Berlekamp
Perfect Proof
Perfect Proof
A proof connecting Mersenne Primes and Perfect Numbers.
Featuring Matt Parker
Perfect Numbers
Perfect Numbers and Mersenne Primes
Re-visiting Perfect Numbers and Mersenne Primes.
Featuring Matt Parker
Dragon Curve Error
Dragon Curve Error
Living with a wrong turn. Piet Hein. Err and err and err again.
Featuring Donald Knuth
Origami Trisection
Trisecting and angle with origami
Origami succeeds where Euclidean Geometry failed.
Featuring Zsuzsanna Dancso
Breakfast
Sound Checks
A compilation of Numberphile sound checks, asking people what they had for breakfast?
Euclidean Geometry
Euclidean Geometry
Much can be accomplished using just a straight edge and compass - but not everything!
Featuring Zsuzsanna Dancso
Infinite Fractions
Infinite Fractions
Stern-Brocot numbers, fractions and rational numbers.
Featuring Matt Parker
Imaginary Erdos
Imaginary Erdos Numbers
Many people are familiar with Erdos Numbers - but how do you end up with an imaginary one?
Featuring Ron Graham
Pixar Animation
Animation at Pixar
How do Pixar characters look so smooth on screen? With mathematics of course!
Featuring Tony DeRose
Leyland Numbers
Leyland Numbers
Some recreational mathmematics and nostalgia for an old Aussie TV show.
Featuring Ed Copeland
Mile of Pi
Equilatral Triangles
A bogus proof that ALL triangle are equilateral - but it looks like nothing was wrong!?
Featuring Carlo Sequin
Mile of Pi
Mile of Pi
Printing Pi to one million decimal places and then rolling it out on a runway.
Featuring Matt Parker and Brady Haran
Making of a Mile of Pi
Mile of Pi (the Making of)
Behind the scenes making our Mile of Pi video.
Featuring Brady Haran and Matt Parker
Three Squares
Lunes
Lunes and Hippocates of Chios. Squaring the Circle. Geometry. Polygons. Spearheads. Crescents.
Featuring Barry Mazur
Brady Numbers
Brady Numbers
The newly 'invented' Brady Numbers show the Fibonacci Numbers' link with the golden ratio may not be so special.
Featuring Matt Parker
Three Squares
Three Square Geometry Problem
Squares, triangles and a problem with 54 solutions.
Featuring Professor Zvezdelina Stankova
Wobbly Circles
Stable Marriage Problem
An algorithm to create stable marriages!!!
Featuring Dr Emily Riehl
Magic Hexagon
Wobbly Circles
How to join two circles in a very special way.
Featuring Matt Parker
Friedman Numbers
Friedman Numbers
Some classic recreational mathematics using basic math operations.
Featuring Ed Copeland
Lucas Numbers
Lucas Numbers
A series of numbers with a better claim to a "golden Ratio" link.
Featuring Matt Parker
Golden Proof
Golden Proof
A proof that Fibonacci Numbers do not have such a great claim to the golden ratio.
Featuring Matt Parker
Dice Bucket
Dice Bucket Challenge
Our twist on the viral fundraiser.
Featuring Matt Parker
Magic Hexagon
Magic Hexagon
The only known Magic Hexagon and how to prove it. Plus some Magic Squares.
Featuring James Grime
Wobbly Table
Wobbly Tables
How to fix a wobblytable with math. Includes the intermediate value theorem.
Featuring Matthias Kreck
Boring Numbers
Boring Numbers
Smallest Uninteresting Number. Paradox. 14972. Boring Number. OEIS. Sequences. Contradiction.
Featuring Tony Padilla
Look and Say
Look and Say Sequence
Look-and-Say Sequence. Conway Constant. Audioactive Numbers. Roman Numerals. Elements. Periodic Table.
Featuring John Conway
Wilson Primes
Wilson Primes
5 13 and 563 are the only known Wilson Primes. Primality Test. Factorials.
Featuring James Grime
Small Numbers
Strong Law of Small Numbers
Low numbers. Prime Numbers. Wilson's Theorem.
Featuring Tony Padilla
Graham's Number
What is Graham's Number
What is Graham's Number. Dimensions. Cubes. Hypercubes. Vertices. Ramsey Theory.
Featuring Ron Graham
Graham's Number Size
Graham's Number (how big)
How big is Graham's Number. Knuth Arrow Notation. Ramsey Theory.
Note on error.
Featuring Ron Graham
Fundamental Theorem of Algebra
Fundamental Theorem of Algebra
Polynomials. Roots. Solutions. Complex Numbers. Equations. Functions.
Featuring David Eisenbud
Happy Ending
Happy Ending Problem
Paul Ardos. George Szekeres. Esther Klein. Convex polygon. Concave. Points. Ramsey Theory. Ronald Graham.
Featuring Ron Graham
Cake Cutting
Cake Cutting
A new (old) way to keep your cake fresh. Francis Galton. Nature. Featuring Alex Bellos
Bamboo Calculator
Bamboo Calculator
Another unboxing. Bamboo Calculator. Featuring Matt Parker
Odd Polynomial
Odd Polynomials
Why polynomials with an odd degree will have at least one real root/solution/zero. Functions. Dedekind Cuts. Featuring David Eisenbud
Monty Hall Problem
Monty Hall Problem
The Monty Hall Problem. Let's Make a Deal. Probability. Stick or Switch. Featuring Lisa Goldberg
Monty Hall Extra
Monty Hall Problem
More on the Monty Hall Problem. Another explanation from Numberphile's creator Featuring Brady Haran
Friends and Strangers
Friends and Strangers
A Facebook twist on the well-known Friends and Strangers Theorem. Ramsey Theory. Featuring Simon Pampena
Monster Group
Monster Group
Monster Group. Sporadic Groups. Group Theory. Featuring John Conway and Tim Burness
Conway and Monster
Life, Death and the Monster
Interview with John Conway on his attitude to mathematics, success and his regrets about the Monster Group
Fable
Math Fable
Scale, similarity and the Pythagorean Theorem. Featuring Barry Mazur
2048
2048
A handful of professors react to the popular game 2048.
Order Chaos
Order from Chaos
Arranging cards in order. Featuring Simon Pampena
Order Chaos 2
Order frm Chaos Part 2
More on Simon's Order from Chaos video. Featuring Simon Pampena
Poincare Conjecture
Poincaré Conjecture
The famed Poincaré Conjecture, the Millennium Problem famously solved by Grigori Pereleman. Featuring Katie Steckles and James Isenberg
Ricci Flow
Ricci Flow
This technique was used to crack the Poincaré Conjecture. Featuring James Isenberg
Soccer Ball Panels
Soccer Ball
Using the Euler Charcteristic on a soccer ball (football). Featuring Teena Gerhardt
Epic Circles
Epic Circles
Circles. Circle Inversion. Pappus Chains. Featuring Simon Pampena
Dominos
Domino Circuits
Dominoes. Cicuits. Gates. Addition. Featuring Matt Parker
Mobius Bridge
Mobius Bridges
Mobius Shapes. Houses. Bridges. Architecture. Featuring Carlo Sequin
Dominos Extra
Dominoes Extras
More on using dominoes to replicate computer circuits. Featuring Matt Parker
Minus 7 over 4
Iteration and Prime Divisors
Iteration. Mandlebrot Set. Prime Divisors. Featuring Holly Krieger
Greatest Infographic
Infographic
Infographic. Napoleon. Russia. Charles Joseph Minard. Featuring James Grime
Measuring Coastline
Measuring Coastline
Coastline. Fractals. Measurement. Mandelbrot. Featuring Steve Mould
Pi Rivers
Pi and Rivers
Sinuosity. Pi. Averages. River Lengths. Ox-bow lakes. Featuring James Grime
Pi Prog Rock
Prog Rock Pi
Progressive Rock song heavily based on Pi and Tau. Featuring Alan Stewart
Brussels Sprouts
Brussels Sprouts
Planar Graphs. Brussels Sprouts Game. Euler's Identity. Featuring Teena Gerhardt
Riemann Hypothesis
Riemann Hypothesis
Riemann Zeta Function. Riemann Hypothesis. Millennium Prizes. Featuring Edward Frenkel
Conway's Game of Life
John Conway Hating Game of Life
Featuring John Conway
Inventing Game of Life
Inventing Game of Life
John von Neumann. Mars. Life. Automata. Featuring John Conway
Extra Log Tables
Log Tables Extra Footage
John Napier. Logarithms. Featuring Roger Bowley
Prime Test
Prime Test
Prime Numbers. AKS Test. Featuring James Grime
Fifth Root
Fifth Root
Fifth Root. Trick. Eulers Theorem. Featuring Carlo Séquin
Carmichael Numbers
Carmichael Numbers
Carmichael Numbers. Fermat Liars. Prime Numbers. Featuring James Grime
Twisted Torus

Twisted Toroids
Torus. Toroids. Topology. Mobius Strips. Mobius Bands. Featuring Carlo Séquin

Knight's Tours Knight's Tour
Chess. Knight's Tour. Hamiltonian Graph. Magic Squares. Magic Knight's Tours. Featuring Brady Haran
Astounding Result 1+2+3+4 (extra footage)
Analytical Continuation. Zeta Function. Ramanujan Summation. Minue one twelfth. Astounding Result. Featuring Tony Padilla and Ed Copeland
Astounding Result 1+2+3+4
Analytic Continuation. Zeta Function. Ramanujan Summation. Minus one twelfth. Astounding Result. Featuring Tony Padilla and Ed Copeland
Pi Visualisation Pi Visualisation
Artistic views of Pi and other numbers. Art by Martin Krzywinski and Cristian Ilies Vasile. Featuring James Grime
Calculator Watch Calculator Watch Unboxing
Calculator Watch Unboxing. Featuring Matt Parker
Calculators Unboxing (Casio) Casio fx-85GT Unboxing
Calculator Unboxing Series. Featuring Matt Parker
NSA NSA Surveillance Extra Footage
National Security Agency. Encryption. Security. Featuring Edward Frenkel
NSA NSA Surveillance
National Security Agency. Encryption. Security. Featuring Edward Frenkel
Pebbling a Chessboard Pebbling a Chessboard - Pt I
An elegant proof involving cloning pebbles on an infinite chessboard. Featuring Zvezdelina Stankova
Watch Ads 10:10 in Watch Ads
Just some fun - it is always 10:10 in watch advertisements
Connect Four Connect Four
Connect Four. Games. Mathematically Solved.
Featuring Brady Haran.
Futurama and Taxicab Numbers Futurama and Taxicab Numbers
1729. 87,539,319. Ramanujan. Hardy. The TV show Futurama.
Featuring Simon Singh.
Shapes of Constant Width Shapes and Solids of Constant Width
Tetrahedron. Reuleaux triangle. UK 50p coin.
Featuring Steve Mould.
Pi and Four Fingers Pi and Four Fingers
Pi in the Simpsons. Digits of Pi. Apu. Four finers. Five fingers. Base 8. Base 10.
Featuring Simon Singh.
Cyclic Numbers Cyclic Numbers
142857. Seventh. Prime Numbers. Cycles. Digits.
Featuring Tony Padilla.
Sloane's Gap Sloane's Gap
OEIS. Integer Database. Frequency of Numbers.
Featuring James Grime.
Fermat's Last Theorem Simpsons and Fermat
Pierre de Fermat. Fermat's Last Theorem. Proof. Andrew Wiles.
Featuring Simon Singh.
Maths and Politics Math and Politics
Politics. Mathematics. Do political beliefes affect math ability? Gun control.
Featuring James Grime.
Calculator Unboxing Calculator Unboxing
Calculator unboxings. Review. Morrisons Desktop Calculator, WHSmith Scientific Calculator and Canon AS-120.
Featuring Matt Parker.
Fermat's Last Theorem Fermat's Last Theorem
Pierre de Fermat. Fermat's Last Theorem. Proof. Andrew Wiles.
Featuring Simon Singh.
Pisano Period Pisano Period
Fibonacci Sequence. Moudulo. Pattern. Repeats. Leonardo Pisano.
Featuring James Grime.
Primer The Primer
Prime Numbers. Gaps. Karl Lautman. Sequence. Red Button.
Featuring James Grime.
Log Tables Log Tables
Logarithms. Log10. Decadic Logarithm. Multiplication. Division.
Featuring Roger Bowley.
Phone Buttons Lay-Out Phone Button Lay-Out
Telephone Keypads. Human Factors. Bell Labs. Rotary Phones.
Featuring Sarah Wiseman.
Can Fish Count? Can Fish Count?
Fish. Numerosity. Number Cognition. Research into whether fish recognise the number of fish in other groups.
Featuring Brian Butterworth.
Brady Haran Brady Haran Live
Live Hang-Out wth Numberphile's creator. Video journalist. Discussing his varius projects.
Featuring Brady Haran.
The Prime Number TheoremThe Prime Number Theorem
Why Primes are like Weeds. Distribution of Prime Numbers. Natural Log. Density of Primes.
Featuring James Grime.
Mills' ConstantMills' Constant
Mills' Constant and Prime Numbers. William H Mills. Prime Gaps.
Featuring James Grime.
Confused AmericansConfused Americans
Americans deal with numbers in the UK. England. USA. Linguistics.
Featuring CGP Grey and Lynne Murphy.
NumberlineNumberline
Number Line. How do you measure with numbers if they have no size? Point. Points.
Featuring Simon Pampena.
Six SequencesSix Sequences
Number sequences. Khintchine's constant, Wieferich primes, Golomb's sequence, Largest metadrome in base n, All 7's and Wild Numbers. Integers.
Featuring Tony Padilla.
More NumberlineMore Numberline
More about the number line. Points.
Featuring Simon Pampena.
Ulam SpiralUlam Spiral
Spirals and Prime Numbers. Stanislaw Ulam. Prime Spiral. Quadratic Polynomials.
Featuring James Grime.
Grandi's SeriesGrandi's Series
Grandi's Series and Thomson's Lamp. Guido Grandi. Diveregent Series.
Featuring James Grime.
Infinity ParadoxesInfinity Paradoxes
Infinity paradoxes. Hilbert's Hotel. Gabriel's Trumpet.
Featuring Mark Jago.
4141
More on prime numbers and Ulam's Spiral - this time focusing on the number 41 and Arthur C. Clarke.
Featuring James Clewett.
CicadasCicadas
How nature uses prime numbers. Why do cicadas emerge every 17 years? Primes.
Featuring Steve Mould.
Math or Maths?Math or Maths?
Linguist. Math (US-style) and Maths (British-style). Mathematics. Plural.
Featuring Lynne Murphy.
Random NumbersRandom Numbers
Using radioactive material to generate random numbers. 7. Seven. Strontium.
Featuring James Clewett.
Illegal NumbersIllegal Numbers
A look at copyright, security, and the concept of illegal numbers. Steganographic.
Featuring James Grime.
PandigitalPandigital
Pandigital. Phone number. Integer. Base. 1023456789. 381,654,729.
Featuring James Grime and Brady Haran.
Brown NumbersBrown Numbers
Brocard's Problem. Paul Erdos.
Featuring Ed Copeland.
Alankey86Alankey86
Mathmatical Music with Alam Stewart, Numberphile's music maestro.
Featuring Alan Stewart and Brady Haran.
TranscendentalTranscendental
What is a Transcendental number? Numbers like e and Pi cannot be made using normal algebra. Complex. Algebraic.
Featuring Simon Pampena.
More SynaesethesiaMore Synaesethesia
More on number/color synesthesia, including your questions for with Alex Dainis
Featuring Alex Dainis and Brady Haran.
Googol SongGoogol Song
Trying to sing a Googol and Googolplex. Music. Comedy.
Featuring Helen Arney & Matt Parker.
Math Jokes ExplainedMath Jokes Explained
Some classic math jokes explained in forensic fashion. Comedy. Standupmaths.
Featuring Matt Parker.
Infinite PrimesInfinite Primes
How do we know there are an infinite number of primes? Dr James Grime explains, with a bit of help from Euclid.
Featuring James Grime.
Math Jokes in BasesMath Jokes in Bases
Math jokes using different bases, because not all are in base 10. OCT31. DEC25.
Featuring Matt Parker.
EnigmaEnigma
The Nazi's Enigma Machine, was a crucial part of World War II. This video explores the mathematics behind it.
Featuring James Grime.
Zero FactorialZero Factorial
0! = 1. Proof. Arrange objects.
Featuring James Grime.
Pie with PiesPie with Pies
Using hundreds of real delicious pies to calculate Pi in the real world. Pukka Pies. Circumference. Radius. Diamater.
Featuring Matt Parker.
Prime GapPrime Gap
An exciting paper about gaps between prime numbers - a step closer to proving the twin prime conjecture.
Featuring Ed Copeland & Tony Padilla.
Fibonacci TartanFibonacci Tartan
A tartan, whose pattern is based on the Fibonacci Sequence. Ribbon. Cloth.
Featuring Brady Haran.
Redefining PiRedefining Pi
The State of Indiana (USA) nearly passed a law which would have made Pi equal 3.2 - strange but true.
Featuring James Grime.
Zeno's ParadoxZeno's Paradox
A 2,500 year old paradox from Zeno that has interested mathmeticians, phycisists, and philosophers. (Clap)
Featuring James Grime.
Safe CrackingSafe Cracking
A chat about some of the ways legendary physicist Richard Feynman cracked safes (filing cabinets) at Los Alamos.
Featuring Roger Bowley.
Real Good Will HuntingReal Good Will Hunting
Who was the real Good Will Hunting? George Dantzig, William Sidis, Srinivasa Ramanujan?
Featuring James Grime.
Squaring CircleSquaring Circle
Squaring a circle? Impossible? Can a square and a circle have the same area?
Featuring James Grime.
Good Will HuntingGood Will Hunting
The Good Will Hunting maths problem. Matt Damon. Homeomorphically irreducible trees.
Featuring James Grime.
French NumbersFrench Numbers
French counting. France. Phone numbers and commas. 79.
Featuring Paul Smith.
Match DayMatch Day
We join the Opta team harvesting data from football/soccer matches on match day. Statistics.
Featuring Matt Furniss from Opta.
Nepal NumbersNepal Numbers
A quick video from Brady Haran, after his return from Nepal, with number news. 1. One.
Featuring Brady Haran.
19 out of 2019 out of 20
Try getting a 20 (highest grade) in France. Nearly impossible. Language. Culture.
Featuring Paul Smith.
Dragon Curve to MusicDragon Curve to Music
The Dragon Curve animated and set to music. Alankey86.
Featuring Pierre Bernard and Alan Stewart.
Pi and the size of the UniversePi and the size of the Universe
Pi is famously calculated to trillions of digits - but Dr James Grime says 39 is probably enough.
Featuring James Grime.
Rubik's CubeRubik's Cube
All the Numberphile videos on Rubik's Cube. Inc God's Number.
Enigma FlawEnigma Flaw
The Nazis' Enigma Machine had a fatal flaw, which allowed the Allies to break the code.
Featuring James Grime.
Numbers and WordsNumbers and Words
How the brain processes numbers vs. how it processes words.
Featuring Brian Butterworth.
Smith NumbersSmith Numbers
What is a Smith number? 4937775 is one. Find out why here.
Featuring Ed Copeland.
Zero EvenZero Even
Is Zero even?
Featuring James Grime and Roger Bowley.
RSA EncryptionRSA Encryption
Banks, Facebook, Twitter and Google use epic numbers - based on prime factors - to keep our Internet secrets. This is RSA public-key encryption.
Featuring James Grime.
Benford's LawBenford's Law
What is the most popular leading digit? Benford's Law tells what it most likely will be.
Featuring Steve Mould.
Anatomy of a GoalAnatomy of a Goal
A numerical look at a World Cup winning goal.
Featuring Sam Green and Opta.
301 YouTube Views301 YouTube Views
Why does the YouTube video view counter seem to get stuck on 301 views?
Featuring Brady Haran and Ted Hamilton.
Unix TimeUnix Time
Time will "end" for 32-bit computers on 19 January, 2038. Are you prepared?
Featuring James Clewett.
Tau vs PiTau vs Pi
Let's Get Ready To Rumble!!!! It's a Tau vs Pi smackdown.
Featuring Steve Mould and Matt Parker.
Graham's NumberGraham's Number
It's the ledgendary Graham's Number. A number so epic it will collapse your brain into a black hole!
Featuring Tony Padilla and Matt Parker.
The Pi CollectionThe Pi Collection
All the Numberphile videos on Pi and its awesomeness.
YahtzeeYahtzee
All of the Numberphile videos about Yahtzee.
Tau SongTau Song
A composition combining Tau and Phi.
Featuring Phil Moriarty.
Spaghetti NumbersSpaghetti Numbers
What's the biggest number you can make in a tin of Numberetti?
Featuring Brady Haran and neighbor kids.
Live with James GrimeLive with James Grime
Get to know a Numberphile regular contributer - Dr. James Grime!
Featuring James Grime and Brady Haran.
Platonic SolidsPlatonic Solids
What are platonic solids, and why are there only five of them?
Featuring James Grime and Katie Steckles.
Card TrickCard Trick
Learn a numbery card trick. Cards.
Featuring Matt Parker.
Golden Ratio SongGolden Ratio Song
Math Metal Song about the Golden Ratio. Dave Brown. Heavy Maetal. Phi.
Featuring Phil Moriarty and Dave Brown.
Dividing by ZeroDividing by Zero
Although zero is important, it can be dangerous. Division. Infinity.
Featuring James Grime and Matt Parker.
ViHart and TetrahedronsViHart and Tetrahedrons
Mathemusician ViHart tackled Numberphile's Yahtzee challenge - but in her own style of course. Dice. Probability.
Featuring ViHart.
Largest PrimeLargest Prime
A new largest known prime number is also a Mersenne Prime.
Featuring Tony Padilla.
TauTau
Should Pi be replaced by Tau? The smackdown begins.
Featuring Phil Moriarty.
Numbers and WordsNumbers and Words
What is your favourite number? Viewers comment.
Featuring Brady Haran.
Kids Get MoneyKids Get Money
The neighbor kids gets paid for their Numberetti brown paper.
Featuring Brady Haran and neighbor kids.
Root 2Root 2
The square root of two is a fascinating number with implications in unlikely places.
Featuring James Grime and Roger Bowley.
4242
Why is 42 so popular?
Featuring James Grime, Gerardo Adesso and Phil Moriarty.
Chicken NuggetsChicken Nuggets
43 is a special number in the world of Chicken McNuggets.
Featuring James Grime.
Favourite NumbersFavourite Numbers
Top YouTubers reveal their favourite numbers.
Featuring Famous YouTubers.
Borremean RingsBorremean Rings
Fun with Borromean Rings.
Featuring John Hunton.
Perfect GamesPerfect Games
Perfect numbers in sports and games.
Featuring Brady Haran.
Keith NumbersKeith Numbers
197 is one of the rare "Keith Numbers".
Featuring Ed Copeland.
2323
Googol and Googolplex
Featuring Tony Padilla and Ria Symonds.
Turn to 400Turn to 400
James Clewett graphs one of his favourite books and explains the significance of 400.
Featuring James Clewett.
Making Golden Ratio SongMaking Golden Ratio Song
Details "behind the scenes" from the making of our Golden Ratio anthem.
Featuring Phil Moriarty and Dave Brown.
Brown's CriterionBrown's Criterion
A "little mathematical trick" which can be performed with powers of two, Fibonacci numbers and prime numbers.
Featuring James Grime.
Nepal FlagNepal Flag
The Nepal constitution has detailed geometrical specifications for its flag.
Featuring James Grime.
Longest TimeLongest Time
What is the longest finite time ever calculated by a physicist?
Featuring Tony Padilla.
Billions and TrillionsBillions and Trillions
We discuss millions, billions, trillions and centillions. Quadrillions, sextillions, milliards, billiards and the Greek myriad.
Featuring James Grime and Tony Padilla.
1 not prime1 not prime
Is 1 a prime number? Apparently not.
Featuring James Grime.
Vampire NumbersVampire Numbers
We sink our teeth into vampire numbers.
Featuring James Grime and Ed Copeland.
2727
Mathematician Katie Steckles in why she likes 27 and why it makes a special appearance in Pi.
Featuring Katie Steckles.
Advent CalendarAdvent Calendar
It's a Numberphile Advent Calendar.
Featuring Brady Haran.
Do numbers exist?Do numbers exist?
Do numbers EXIST? You know, REALLY EXIST?
Featuring Dr. Jonathan Tallant.
Curta CalculatorCurta Calculator
The Curta is a pocket-sized, mechanical, digital calculator, invented by Curt Herzstark.
Featuring Alex Bellow.
Usain Bolt and 9.63Usain Bolt and 9.63
Would Albert Einstein agree that Usain Bolt ran the 100m in 9.63 seconds?
Featuring Tony Padilla.
88488848
Mt. Everest is really tall. How tall? It MIGHT be 8848 meters, we think.
Featuring Brady Haran.
Dragon CurveDragon Curve
Beautiful Dragon Curves, Fractals and Jurassic Park.
Featuring Rob Eastaway.
Base 12Base 12
We marked the date 12/12/12 with a video about the merits of the dozenal/duodecimal system.
Featuring James Grime.
666666
666 (and sometimes 616) is the notorious Number of the Beast. What's all that about? And what has roulette got to do with it!?
Featuring Pete Watts and James Grime.
Three is EverywhereThree is Everywhere
Almost all numbers contain the digit three - and we can prove it!?
Featuring James Grime.
Avogadro's NumberAvogadro's Number
Discussing Avogadro's Number on Mole Day.
Featuring Martyn Poliakoff.
InfinityInfinity
Sometimes infinity is even bigger than you think.
Featuring James Grime.
27 Card Trick27 Card Trick
What's the 'most mathematically beautiful' card trick? Find out here.
Featuring Matt Parker.
Batman CurveBatman Curve
Atomic batteries to power! Turbines to speed! The amazing Batman equation.
Featuring James Grime.
The Internet if FullThe Internet if Full
What do we do now that all 4,294,967,296 IP addresses have been given out?
Featuring James Clewett.
220 and 284220 and 284
220 and 284 get along fairly well? They are one example of so-called amicable numbers.
Featuring James Grime.
7 Happy Number7 Happy Number
What makes a number happy? Ask the number 7.
Featuring Dr. Ria Symonds.
MelancoilMelancoil
"Happification" and the resulting structures it creates. Includes the fascinating Melancoil!.
Featuring Matt Parker.
255 Binary and Pac-Man255 Binary and Pac-Man
Explaining binary to understand why Pac-Man becomes unplayable after 255 levels.
Featuring James Clewett.
Lucky NumbersLucky Numbers
Why are some numbers "lucky" and some are not?
Featuring Dr. Ria Symonds.
1729 & Taxi Cabs1729 & Taxi Cabs
The number 1729 is "famous" among mathematicians. Why?
Featuring James Grime and Roger Bowley.
DyscalculiaDyscalculia
Dyscalculia is a learning disability involving mathematics and numbers.
Featuring Brian Butterworth.
One to One MillionOne to One Million
How fast can you add the digits one to to one million? Pretty fast with this trick.
Featuring James Grime.
163163
163 is a strange and complex number.
Featuring Alex Clark.
2323
What's the probability that two people on the football/soccer pitch share a birthday? Surprisingly low.
Featuring James Grime.
17 and suduko17 and suduko
17 is the minimum number of clues required to give a unique sudoku solution - but how did mathematicians prove this?
Featuring James Grime.
Grafting NumbersGrafting Numbers
Square roots, strange patterns and a mysterious constant - what are Matt's "grafting numbers" all about? And why is computer programming like skydiving?
Featuring Matt Parker.
31 Mersenne Prime31 Mersenne Prime
31 is one of the special Mersenne Prime numbers. They are related to perfect numbers.
Featuring James Grime.
Chinese NumbersChinese Numbers
8 and 6 are lucky but 4 is unlucky... if you're Chinese!
Featuring Xiaohui Yuan.
998001998001
998,001 and its Mysterious Recurring Decimals.
Featuring James Grime.
10 Factorial10 Factorial
"I'll see you again in 10! seconds!" - When will I see you again?
Featuring James Grime.
Sexy PrimeSexy Prime
Sexy primes are prime numbers which differ by six - but what is an "Octomus Prime"???
Featuring James Grime.
61746174
Try 69! on your calculator, but don't even think about 70!
Featuring Professor Laurence Eaves.
Leap YearLeap Year
Why do we have lear year? Because our calendar is a mess.
Featuring Meghan Gray.
81288128
For many years, 8128 was the largest known perfect number. But what is a perfect number?
Featuring James Grime.
Abel PrizeAbel Prize
Endre Szemerédi wins the mathematics equivalent of the Nobel Prize - the 2012 Abel Prize. He wins 6,000,000 Norwegian Kroner for his troubles.
Featuring James Grime and David Hodge.
61746174
6174 is also known as Kaprekar's Constant.
Featuring Roger Bowley.
ZequalsZequals
Ruthless rounding using the "zequals" estimation method.
Featuring Rob Eastaway.
15 and bumfit15 and bumfit
Numbers can be interesting when studied in different languages and dialects - such as in Lincolnshire where we have dik, figgit and bumfit.
Featuring Roger Bowley.
3737
37. Who would have thought it was such fun?
Featuring Matt Parker.
SixtySixty
The ancient Babylonians used a number system with base 60 (sexagesimal). Why?
Featuring Thomas Woolley.
153153
153 thinks it's great. That's why it's a greatexample of a narcissistic number.
Featuring Dr. Ria Symonds.
5 and tiling5 and tiling
Why five-sided figures pose a problem, and a bit about the importance of Penrose Tiling.
Featuring John Hunton.
137137
Pythagorean Primes. Why 5, 13 and 137 are three of the favourites.
Featuring Professor Laurence Eaves.
LotteryLottery
The chance of picking the six winning numbers from the 49 balls in the UK National Lottery is one in 13,983,816 - on the other hand, the odds of selecting no balls???
Featuring James Clewett.
SynesthesiaSynesthesia
Do you see numbers as colours?
Featuring Alex Dainis.
41337 Kleibers Law41337 Kleibers Law
The fraction three quarters has a particular interest to biologists because of its link to the research of Max Kleiber and metabolic rates in animals.
Featuring Thomas Woolley.
Truncated IcosahedronTruncated Icosahedron
The 32-sided truncated icosahedron forms the basis of many footballs (soccer balls!). It's also a big deal in chemistry.
Featuring James Grime.
Alex BellosAlex Bellos
Author Alex Bellos tells us how he wrote a best-selling book about numbers.
Featuring Alex Bellos.
14 and Shakespeare's Sonnets14 and Shakespeare's Sonnets
Poetry and numbers are more closely linked than you may think, citing Shakespeare's 14-line sonnets and iambic pentameter as examples.
Featuring Roger Bowley.
31 Mersenne Prime31 Mersenne Prime
3435 is Matt Parker's "ex" favourite number - but they are still on good terms.
Featuring Matt Parker.
HexadecimalHexadecimal
Did you know "f" is an important number to computer?
Featuring James Clewett.
1616
We discuss the number 16 - a perfect square - and how sitting at table 16 led to something bigger.
Featuring Dr Ria Symonds and Matt Parker.
SunflowersSunflowers
Planting sunflowers in the interests of number research and the memory of Alan Turing.
Featuring James Grime.
1111
All about number 11, marking the last binary day of a generation: 11.11.11. Also CD error correction and detection.
Featuring James Grime.
Brady Haran
Brady Haran