Leyland Numbers and Leyland Primes with Professor Ed Copeland... Reddit discussion: http://redd.it/2kl1wp More links & stuff in full description below ↓↓↓ Thanks to Patreon supporters: Herschal Sanders -- Joshua Wilson and Andrew Touchet -- Lê -- Stan Ciprian -- Alex Bozzi -- OK Merli -- Tracy Parry -- Micky Baeza -- plusunim -- Elias Jonathan List -- Filipe Junqueira -- Thomas J. Petersen -- Spiked Math --- Bill Shillito YOU CAN SUPPORT US TOO: http://www.patreon.com/numberphile Professor Ed Copeland is a physics and cosmology professor at the University of Nottingham. With thanks to Paul Leyland: http://www.leyland.vispa.com/ The Wikipedia Page is a good jump-off point for plenty of detailed stuff about Leyland Numbers: http://en.wikipedia.org/wiki/Leyland_number OEIS Leyland Numbers: http://oeis.org/A076980 Article: http://www.leyland.vispa.com/numth/primes/xyyx.htm And thanks to the Leyland Brothers for childhood memories! :) Support us on Patreon: http://www.patreon.com/numberphile NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9 Numberphile T-Shirts: null Other merchandise: https://store.dftba.com/collections/numberphile