Featuring Tony Padilla... Check out Brilliant (and get 20% off their premium service): https://brilliant.org/numberphile (sponsor) More links & stuff in full description below ↓↓↓ Extra footage and trick from this interview: https://www.youtube.com/watch?v=ZWeUNUCf2rI Card trick and shuffling videos on Numberphile: http://bit.ly/Cards_Shuffling Belphegor's Prime: https://www.youtube.com/watch?v=zk_Q9y_LNzg Numberphile playing cards (limited and occasional supply): http://bit.ly/NumberphileCards I Love Norrie stickers (created just to annoy Tony): https://teespring.com//i-love-norrie-numberphile Tony is a professor at the University of Nottingham. Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. https://www.simonsfoundation.org/outreach/science-sandbox/ And support from Math For America - https://www.mathforamerica.org/ 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 Videos by Brady Haran Patreon: http://www.patreon.com/numberphile Numberphile T-Shirts: null 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