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

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MnStatusDetails
12577Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
9256673723.1old
251318644811134.52008-08-26 19:58:37
558792757476961348612972375.62008-08-29 02:24:31
279670047872101034677188625192994.52009-12-31 16:20:40
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001255 / 9201
Estimated T-Level: 40.7
TF below 2^130 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse8A2C37D584D917804013
Verified2017-10-02kkmrkkblmbrbk8A2C37D584D917804013
Verified2017-12-07ATH8A2C37D584D9178041153913
Verified2020-04-17Oliver Kruse5268AF54AD7E64374172053
Verified2024-07-01kkmrkkblmbrbk5268AF54AD7E64374536753
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M12577/25131864481/27967004787210103467718862519/55879275747696134861297/9256673 : 5268AF54AD7E6437
PRP: Verified
PRP without proof (small exponent)
2023-05-13Anton RepkoNF-PM1
B1=100000000000, B2=120417199046794650
2022-02-05JossNF-PM1
B1=1000000, B2=3910366209750
2020-04-17Oliver KruseC-PRP
M12577/9256673/25131864481/55879275747696134861297/27967004787210103467718862519 : 5268AF54AD7E6437
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M12577/9256673/25131864481/55879275747696134861297/27967004787210103467718862519 : 8A2C37D584D91780
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M12577/9256673/25131864481/55879275747696134861297/27967004787210103467718862519 : 8A2C37D584D91780
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M12577/known_factors : 8A2C37D584D91780
PRP without proof (not generated)
2009-12-31Matthias WurtingerF-ECM
Factor: 27967004787210103467718862519
2008-08-29-Anonymous-F-ECM
Factor: 55879275747696134861297
2008-08-26-Anonymous-F
Factor: 25131864481