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Let f(n) be the sum of all the divisors of a positive integer n. If f(f(n))=n+2, then call n superdeficient. How many superdeficient positive integers are there?

 Jul 5, 2019
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The superdeficient numbers are 8, 12, and 15, for a total of 3 superdeficient positive integers.

 Nov 21, 2019

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