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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Exponent Range:










MnStatusDetails
1941031Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
31056497824.9old
3396027837611238.32008-07-15 07:48:28
35368418725271341.72008-07-15 07:48:28
8880948554866391549.72014-05-08 12:19:03
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02KrieselCE4610DF75C7A806013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver KruseC0516F7F91DC19B94013
Verified2017-11-15kkmrkkblmbrbkC0516F7F91DC19B94168614813
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
CE4610DF75C7A806
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-15kkmrkkblmbrbkC-PRP
M1941031/31056497/339602783761/3536841872527/888094855486639 : C0516F7F91DC19B9
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1941031/31056497/339602783761/3536841872527/888094855486639 : C0516F7F91DC19B9
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1941031/31056497/339602783761/3536841872527/888094855486639 : C0516F7F91DC19B9
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2014-05-08TJAOIF
Factor: 888094855486639
2008-07-15J FeitsmaF
Factor: 3536841872527
2008-07-15J FeitsmaF
Factor: 339602783761