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
1967657Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
11805943823.5old
487978937928.92008-07-15 07:48:46
5948135142711831549.12014-04-23 10:18:28
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)2025-09-02Kriesel2562DF6DB5C53876013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver Kruse0F1B8D091CB90BB23013
Verified2017-11-12kkmrkkblmbrbk0F1B8D091CB90BB2374792813
History
DateUserTypeResult
2025-09-03JurzalCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
2562DF6DB5C53876
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2022-11-02USAFSSNF-PM1
B1=650000, B2=730452492
2022-04-12Lisander ViaeneNF-PM1
B1=500000, B2=1964033610
2017-11-12kkmrkkblmbrbkC-PRP
M1967657/11805943/487978937/594813514271183 : 0F1B8D091CB90BB2
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1967657/11805943/487978937/594813514271183 : 0F1B8D091CB90BB2
PRP: Verified
PRP without proof (not generated)
2014-04-23TJAOIF
Factor: 594813514271183
2008-07-15J FeitsmaF
Factor: 487978937