The Best Episodes of Numberphile

Numberphile video about number 11, marking the last binary day of a generation: 11.11.11. Exploring barcodes, check digits and CD technology. Filmed at the home ground of Nottingham Forest Football Club, The City Ground.

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Explaining binary to understand why Pac-Man becomes unplayable after 255 levels.

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We discuss the number 16 - a perfect square - and how sitting at table 16 led to something bigger for Matt Parker. In this video is Dr Ria Symonds from the University of Nottingham.

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For many years, 8128 was the largest known perfect number. But what is a perfect number?

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6174 is also known as Kaprekar's Constant.

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69 is the largest number that most hand-held calculators can factorialize!

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Why do 220 and 284 get along so well? Dr James Grime introduces us to the world of so-called amicable numbers.

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Numbers can be interesting when studied in different languages and dialects - such as in Lincolnshire where we have dik, figgit and bumfit.

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Tom Crawford discusses drag - then we drop the Empire State Building and Eiffel Tower into the ocean...

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Eric Lander discusses how quasiperfect numbers gave him a start...

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Professor Ed Copeland shows a proof by Joseph "Voldemort" Fourier that e is irrational.

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This video features Tim Harford.

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Featuring Tom Crawford.

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