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

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Exponent Range:










MnStatusDetails
10531Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
965314637111136.5old
719714983244949065832066.02008-08-29 02:24:26
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001292 / 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 Kruse894CBB391542D58F2013
Verified2017-10-12kkmrkkblmbrbk894CBB391542D58F2345613
Verified2020-04-17Oliver Kruse396F390FEB7EC3A92502153
Verified2024-07-01kkmrkkblmbrbk396F390FEB7EC3A92824453
P-1 factors
DateFactorB1B2
2022-11-0971971498324494906583100000000000120443211520241616
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M10531/71971498324494906583/96531463711 : 396F390FEB7EC3A9
PRP: Verified
PRP without proof (small exponent)
2022-11-09Anton RepkoF-PM1
Factor: 71971498324494906583 / (P-1, B1=100000000000, B2=120443211520241610)
2021-08-02ViliamFNF-PM1
B1=250000000, B2=40250000000
2020-04-17Oliver KruseC-PRP
M10531/96531463711/71971498324494906583 : 396F390FEB7EC3A9
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M10531/96531463711/71971498324494906583 : 894CBB391542D58F
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M10531/96531463711/71971498324494906583 : 894CBB391542D58F
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M10531/96531463711/71971498324494906583 : 894CBB391542D58F
PRP without proof (not generated)
2016-09-07kkmrkkblmbrbkNF-PM1
B1=100000000, B2=10000000000, E=12
2008-08-29-Anonymous-F-ECM
Factor: 71971498324494906583