For many years, 8128 was the largest known perfect number. But what is a perfect number? This video features Dr James Grime. James' own YouTube channel full of maths stuff can be found at http://www.youtube.com/singingbanana Follow Numberphile on Facebook at http://www.facebook.com/pages/Numberphile/116862298423181 Numberphile tweets at https://twitter.com/#!/numberphile Videos by Brady Haran
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