From Numberphile.

Featuring James Grime. Bug Byte puzzle from Jane Street at https://bit.ly/janestreet-bugbyte and programs at https://bit.ly/janestreet-programs (episode sponsor) — More links & stuff in full description below ↓↓↓

Dr James Grime discussing triangular numbers, cubes, pentagonal numbers, hexagonal numbers, tetrahedral numbers and Pollock’s Conjecture.

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Thanks to viewers for helping find the 343867 sums, including Arne, Alex, Sam, Felipe, Pablo, Ewoud and Michael.