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

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MnStatusDetails
1249799Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
2499599721.3old
9998393723.32008-07-15 09:57:13
18222069431030.82008-07-15 09:57:13
443728636971135.42008-07-15 09:57:13
ECM
DigitsB1Curves
2550000280 / 280
30250000104 / 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)2025-09-01Kriesel47914C511FB403E0013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-29Oliver KruseA9EDBB8BC9B5C8E14013
Verified2017-10-20kkmrkkblmbrbkA9EDBB8BC9B5C8E1469176313
History
DateUserTypeResult
2025-09-02IvanIsturizCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-01KrieselC-PRP
47914C511FB403E0
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-10-20kkmrkkblmbrbkC-PRP
M1249799/2499599/1822206943/44372863697/9998393 : A9EDBB8BC9B5C8E1
PRP: Verified
PRP without proof (not generated)
2017-09-29Oliver KruseC-PRP
M1249799/2499599/1822206943/44372863697/9998393 : A9EDBB8BC9B5C8E1
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=300000, B2=10000000, E=12
2008-07-15J FeitsmaF
Factor: 9998393
2008-07-15J FeitsmaF
Factor: 44372863697
2008-07-15J FeitsmaF
Factor: 1822206943