Just a little bonus bit with Neil Sloane cut from the main video at: https://youtu.be/OeGSQggDkxI Neil Sloane is the founder of the Online Encyclopedia of Integer Sequences: https://oeis.org A-Train Sequence: https://oeis.org/A000054 Philadelphia Sequence: https://oeis.org/A007826 Lunar Arithmetic: https://youtu.be/cZkGeR9CWbk Sloane's gap: https://youtu.be/_YysNM2JoFo NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran Support us on Patreon: http://www.patreon.com/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ A run-down of Brady's channels: http://www.bradyharan.com Sign up for (occasional) emails: http://eepurl.com/YdjL9