Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
103886137Composite: 2 known prime factors
Factored
FactorDigitsBitsDate
49865345771032.22007-09-18 22:21:28
255559897031134.62007-09-18 22:21:28