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Mathematics, 04.01.2021 18:40 22MadisonT

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?

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Let $f(n)$ be the sum of the positive integer divisors of $n$. If $n$ is prime and $f(f(n))$ is also...
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