https://en.wikipedia.org/wiki/Perfect_number https://en.wikipedia.org/wiki/Mersenne_prime https://en.wikipedia.org/wiki/Prime_number https://stackoverflow.com/questions/2432669/test-if-a-number-is-fibonacci
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https://en.wikipedia.org/wiki/Perfect_number
https://en.wikipedia.org/wiki/Mersenne_prime
https://en.wikipedia.org/wiki/Prime_number
https://stackoverflow.com/questions/2432669/test-if-a-number-is-fibonacci