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Mathematics 18 Online
OpenStudy (anonymous):

A number N is perfect if the sum of its divisors, including 1 but excluding itself, add up to N. So, for example, 28 is perfect because 1 + 2 + 4 + 7 + 14 = 28. Find an odd perfect number, or prove that no such number exists.

OpenStudy (anonymous):

http://en.wikipedia.org/wiki/Perfect_number

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