Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
12000563Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
35521666491031.7old
2264026215591237.72008-09-08 07:44:56
2681583912196192391857.92015-02-04 06:14:29
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-10-17timbit09C350EFB41A975831094051553
History
DateUserTypeResult
2023-06-13nordiNF-PM1
B1=400000, B2=428459850
2021-11-09nordiNF-PM1
B1=400000, B2=21200000
2021-10-17TheDogPrescottCERT
PRP Certification
Proof certified good
2021-10-17timbitC-PRP
M12000563/3552166649/226402621559/268158391219619239 : 09C350EFB41A9758
PRP proof power = 8
PRP: Verified
Proof certified good
2015-02-04BloodIceF
Factor: 268158391219619239 / TF: 1-61
2008-09-08Will EdgingtonF
Factor: 226402621559