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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: Numberphile on Facebook: Numberphile tweets:

Videos by Brady Haran

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  • Happy Number

    Happy Number The process for determining a happy or unhappy number is as follows. Take a...

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current11:36, July 25, 2013Thumbnail for version as of 11:36, July 25, 2013480 × 269 (6 KB)CAFischer (wall | contribs)created video