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
1939913Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
11639479823.5old
27158783824.72008-07-15 07:48:28
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)2025-09-02KrieselBA50763D43AEB89E013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver Kruse44CB3B2C40CDBD302013
Verified2017-11-11kkmrkkblmbrbk44CB3B2C40CDBD30229854713
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
BA50763D43AEB89E
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2025-06-29alex4NF-PM1
B1=7759666, B2=91023182250
2017-11-11kkmrkkblmbrbkC-PRP
M1939913/11639479/27158783 : 44CB3B2C40CDBD30
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1939913/11639479/27158783 : 44CB3B2C40CDBD30
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 27158783