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Professor Ed Copeland on Friedman Numbers - more below. More links & stuff in full description below ↓↓↓ Thanks to these supporters: Herschal Sanders --- Alex Bozzi --- OK Merli --- Joshua Wilson/Andrew Touchet --- Lê --- plusunim --- Jordan White --- Micky Baeza --- Tracy Parry And of course the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Support us on Patreon: http://www.patreon.com/numberphile Adopted Numbers: http://www.numberphile.com/supporters/ FRIEDMAN NUMBERS (Friedman's site): http://bit.ly/FriedmanNumbers Pandigital Numbers: http://youtu.be/gaVMrqzb91w Vampire Numbers: http://youtu.be/3ZMnVd4ivKQ Discuss this video on reddit: http://redd.it/2g78sz 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: https://teespring.com/stores/numberphile Other merchandise: https://store.dftba.com/collections/numberphile