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Old 2020-01-18, 04:48   #506
GP2
 
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Sep 2003

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The 342nd fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is M2887.

The most recent factor (56 digits) was found by Ryan Propper and the PRP test was done by Niels_Mache_Nextcloud.

The cofactor has already been certified prime.

FactorDB link
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