Recall (see Exercise 3.13) that an integer n is called perfect if it equals the sum of
Chapter 39, Problem 39.15(choose chapter or problem)
Recall (see Exercise 3.13) that an integer n is called perfect if it equals the sum of all its divisors d with 1 d < n. For example, 28 is perfect because 1C2C4C7C14 D 28. Let a be a positive integer. Prove that if 2 a 1 is prime, then n D 2 a1 .2a 1/ is perfect
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