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
191Composite, with 4 known prime factors. Cofactor is PRP (Probable-Prime).
Factored
FactorDigitsBitsDate
38338.6old
70685692571032.7old
399401322411135.2old
3325845165192011548.2old
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2018-01-24_p95holder_PRP_PRP_PRP_PRP_4013
History
DateUserTypeResult
2018-01-24_p95holder_P-PRP
M191/383/7068569257/39940132241/332584516519201 is a probable prime.