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Another Wilson test for twin primes

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  • Chris Caldwell
    There are lots of these. but here is another nice one by M. Chaves: Theorem. A necessary and sufficient condition for the integers n 7 and n+2 to be twin
    Message 1 of 1 , Dec 7, 2009
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      There are lots of these. but here is another nice one by M. Chaves:

      Theorem. A necessary and sufficient condition for the integers n>7 and n+2 to be twin primes is that 4(n−3)!+2+n is divisible by n but not by n+2.

      http://arxiv.org/abs/math/0211034
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