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

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Exponent Range:










MnStatusDetails
3256987Factored
FactorDigitsBitsDate
67386539489112736811537268732892.42020-08-26 04:58:07
ECM
DigitsB1Curves
255000015 / 280
Estimated T-Level: 20.3 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Howard ThompsonAD3B3963212B79B60
Verified (Factored)Frode FjeldAD3B3963212B79B60
Verified (Factored)1999-06-06Kerry MitchellAD3B3963212B79B62479711
Verified (Factored)2009-04-02ANONYMOUSAD3B3963212B79B62368459
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-08-26jvang37B956BC0DF555541189030253
P-1 factors
DateFactorB1B2
2020-08-2667386539489112736811537268734000000150000000
History
DateUserTypeResult
2022-09-03JossNF-PM1
B1=1297196, B2=223284600
2022-01-06JossNF-PM1
B1=1297196, B2=116447100
2021-02-22JossNF
no factor from 2^66 to 2^67
2021-02-21JossNF
no factor from 2^65 to 2^66
2021-01-18JossNF-PM1
B1=445800, B2=3256987, E=6
2020-08-26George WoltmanCERT
PRP Certification
Proof certified good
2020-08-26jvangC-PRP
M3256987/6738653948911273681153726873 : 37B956BC0DF55554
PRP proof power = 7
PRP: Verified
Proof certified good
2020-08-26mikrF-PM1
Factor: 6738653948911273681153726873 / (P-1, B1=4000000, B2=150000000, E=12)
2019-01-07TJAOINF
no factor from 2^67 to 2^68
2017-03-29Gordon SpenceNF
no factor from 2^66 to 2^67
2016-01-18JossNF-PM1
B1=415800, B2=4158000, E=6
2015-06-28ThaNF
no factor from 2^65 to 2^66
2015-02-18VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-18VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-07JossNF-PM1
B1=99414
2014-06-11JossNF-PM1
B1=79707
2013-01-03dbaughNF
no factor from 2^62 to 2^63
2011-09-16markrNF
no factor to 2^62
2011-09-13USAFSSNF-PM1
B1=60000, B2=1050000, E=6
2009-07-05Carsten KossendeyNF-PM1
B1=15000, B2=191250
2009-04-03S485122NF
no factor from 2^60 to 2^61
2009-04-02ANONYMOUSC-LL
AD3B3963212B79B6