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

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MnStatusDetails
2922961Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
560572924979178210732065.62013-06-19 21:53:34
1983672313887098055666089692787.42025-06-22 09:40:32
ECM
DigitsB1Curves
255000047 / 280
Estimated T-Level: 20.8 ⓘ
TF below 2^64 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Joel Armengaud99FBA52A1D5173730
Verified (Factored)1999-08-07Jon Fournie99FBA52A1D5173732148978
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-25Oliver KruseC9FEC92E0226EFFA194929953
Verified (Factored)2017-12-08ATHC9FEC92E0226EFFA143057953
Verified2025-06-22OdicinC9FEC92E0226EFFA2265200853
History
DateUserTypeResult
2025-06-22LynnUnownCERT
PRP Certification
Proof certified good
2025-06-22OdicinC-PRP
M2922961/56057292497917821073/198367231388709805566608969 : C9FEC92E0226EFFA
PRP proof power = 7
PRP: Verified
Proof certified good
2025-06-22OdicinF-ECM
Factor: 198367231388709805566608969 / (ECM curve 14, B1=50000, B2=86479575, Edwards Sigma=3879330703195913)
2023-02-07USAFSSNF-PM1
B1=360000, B2=282695490
2022-03-10LordJuliusNF
no factor from 2^1 to 2^60
2017-12-08ATHC-PRP
M2922961/56057292497917821073 : C9FEC92E0226EFFA
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-25Oliver KruseC-PRP
M2922961/56057292497917821073 : C9FEC92E0226EFFA
PRP: Verified (Factored)
PRP without proof (not generated)
2013-06-19Pool PartyF-ECM
Factor: 56057292497917821073
2013-01-10dbaughNF
no factor from 2^62 to 2^63
2012-01-07Grant McCrackenNF
no factor from 2^61 to 2^62
2010-11-13markrNF-PM1
B1=105000, B2=2283750, E=6
2009-02-14Sturle SundeNF
no factor from 2^60 to 2^61