Let sigma(n) be the sum of the positive divisors of n.

Let n be an integer with n>0. Prove that n is composite if and only if sigma(n) > n + sqrt(n)

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- October 12th 2008, 01:20 PMmndi1105Sum of Positive Divisors Function
Let sigma(n) be the sum of the positive divisors of n.

Let n be an integer with n>0. Prove that n is composite if and only if sigma(n) > n + sqrt(n) - October 12th 2008, 02:36 PMThePerfectHacker