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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

The Largest Small Hexagon

The Largest Small Hexagon

Brady Haran
James Grime

Featuring Dr James Grime.

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Ron Graham's paper: http://www.math.ucsd.edu/~fan/ron/papers/75_02_hexagon.pdf

James Grime: https://www.singingbanana.com

His YouTube channel: https://www.youtube.com/user/singingbanana

More James on Numberphile: http://bit.ly/grimevideos

Bertrand's Paradox

Bertrand's Paradox
The Most Wanted Prime Number

The Most Wanted Prime Number