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Untouchable Numbers - Numberphile

A continuation of our video about 276 and Aliquot Sequences with Ben Sparks. See the first part at    • An amazing thing about 276 - Numberphile   More links & stuff in full description below ↓↓↓ Ben Sparks: https://www.bensparks.co.uk More Ben Sparks on Numberphile: http://bit.ly/Sparks_Playlist Perfect Numbers on Numberphile:    • Perfect Numbers on Numberphile   Amicable Numbers:    • 220 and 284 (Amicable Numbers) - Numb...   Patreon:   / numberphile   Numberphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://www.janestreet.com We're also supported by the Simons Laufer Mathematical Sciences Institute (formerly MSRI): http://bit.ly/MSRINumberphile Our thanks also to the Simons Foundation: https://www.simonsfoundation.org NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook:   / numberphile   Numberphile tweets:   / numberphile   Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Animation and editing by Pete McPartlan Numberphile T-Shirts and Merch: https://teespring.com/stores/numberphile Brady's videos subreddit:   / bradyharan   Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9