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MATH / Let f(n) be the sum of the positive integer divisors of n. If n is prime and f(f(n)) is also prime, then call n a bouncy prime. What is the smallest bouncy prime? · Discussion

Discussing Let f(n) be the sum of the positive integer divisors of n. If n is prime and f(f(n)) is also prime, then call n a bouncy prime. What is the smallest bouncy prime? · MATH

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