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
257Composite, with 2 known prime factors. Cofactor is PRP (Probable-Prime).
Factored
FactorDigitsBitsDate
5350061388143591548.9old
11556853952466191826730332579.9old
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2018-01-24_p95holder_PRP_PRP_PRP_PRP_2013
History
DateUserTypeResult
2018-01-24_p95holder_P-PRP
M257/535006138814359/1155685395246619182673033 is a probable prime.