Numberphile

More links & stuff in full description below ↓↓↓ There are only three pairs of Brown Numbers - and only five of the numbers themselves (because 5 is repeated)... At least we think that's all of them? No-one has proven it. This is called Brocard's Problem and has been entertained by great mathematicians such as Paul Erdos. The Brown Numbers are (5,4) (11,5) and (71,7). Professor Ed Copeland works at the University of Nottingham. He also features in our Sixty Symbols physics videos at http://www.youtube.com/sixtysymbols --- https://twitter.com/ProfEdCopeland Brown Paper Blog Post: http://periodicvideos.blogspot.co.uk/2012/02/brown-paper-question.html 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 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