Stones on an Infinite Chessboard
Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...
Another curious puzzle and number sequence from Neil Sloane.
More of our videos with Neil: http://bit.ly/Sloane_Numberphile
Neil Sloane is founder of the On-Line Encyclopedia of Integer Sequences: https://oeis.org
More of our videos with Neil Sloane: http://bit.ly/Sloane_Numberphile
Pebbling a chessboard with Zvezda Stankova: https://youtu.be/lFQGSGsXbXE
