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Old 2017-12-04, 07:41   #3
R. Gerbicz
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"Robert Gerbicz"
Oct 2005

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Originally Posted by retina View Post
Just posting the exponent is enough.
No it is not enough, and what would prove that it is prp (say for base=3) or prime? Suppose that all 7+ billion people email a (different smallish) exponent then there will be roughly 20 Mersenne prime exponents in that, but we don't know which ones.
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