Numberphile — Season 1

111.11.11
08 Nov 2011
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.
2255 and Pac-Man
17 Nov 2011
Explaining binary to understand why Pac-Man becomes unplayable after 255 levels.
316
23 Nov 2011
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.
48128 and Perfect Numbers
28 Nov 2011
For many years, 8128 was the largest known perfect number. But what is a perfect number?
56174
05 Dec 2011
6174 is also known as Kaprekar's Constant.
669!
08 Dec 2011
69 is the largest number that most hand-held calculators can factorialize!
7220 and 284 (Amicable Numbers)
19 Dec 2011
Why do 220 and 284 get along so well? Dr James Grime introduces us to the world of so-called amicable numbers.
815 bumfitfinale
22 Dec 2011
Numbers can be interesting when studied in different languages and dialects - such as in Lincolnshire where we have dik, figgit and bumfit.