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7 and Happy Numbers - Numberphile

7 is an example of a happy number, as opposed to sad numbers. What makes a number happy?Dr Ria Symonds is from the University of Nottingham.Website: http://www.numberphile.com/Numberphile on Facebook: http://www.facebook.com/numberphileNumberphile tweets: https://twitter.com/numberphileVideos by Brady HaranAbout the brown paper: http://periodicvideos.blogspot.com/2012/02/brown-paper-question.html
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