A little extra bit from our Amazing Graphs Trilogy. All the videos at: http://bit.ly/Amazing_Graphs Neil Sloane is founder of the OEIS: https://oeis.org/ More videos with Neil: http://bit.ly/Sloane_Numberphile Amazing Graphs Part 1: https://www.youtube.com/watch?v=pAMgUB51XZA Part 2: https://www.youtube.com/watch?v=o8c4uYnnNnc Part 3: https://www.youtube.com/watch?v=j0o-pMIR8uk Extra Bit: https://www.youtube.com/watch?v=4x2kdLFUSvM 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