Wilson primes are prime numbers where (p-1)! + 1 can by divided by p twice to yield an integer. So far, only 3 are known. What is special about this rule is that no composite number can pass it.

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Wilson primes are prime numbers where (p-1)! + 1 can by divided by p twice to yield an integer. So far, only 3 are known. What is special about this rule is that no composite number can pass it.

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