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
1878791Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
3757583721.8old
438885577611135.42008-07-15 07:47:46
4524429334571238.72008-07-15 07:47:46
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 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)2025-09-02KrieselAC04CE6AF3BCBAD1013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-04Oliver Kruse28DDF4BE2FDD64D53013
Verified2017-11-08Chang Chia-Tche28DDF4BE2FDD64D53172654113
History
DateUserTypeResult
2025-09-03KrieselCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
AC04CE6AF3BCBAD1
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-08Chang Chia-TcheC-PRP
M1878791/3757583/43888557761/452442933457 : 28DDF4BE2FDD64D5
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1878791/3757583/43888557761/452442933457 : 28DDF4BE2FDD64D5
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 452442933457
2008-07-15J FeitsmaF
Factor: 43888557761