<<Now we can filter out multiples of small primes>>
I'm assuming that we don't need to divide by factors divisible by 3 or 5,
etc, because a Mersenne number cannot be divisible by 3 or 5 because they
don't have the structure 2kp+1 themselves? (Excluding the REALLY low Mersenne
numbers). Ideally, we'd like to only test factors that are prime
themselves.... Am I right?
S.T.L.
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