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

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Exponent Range:










MnStatusDetails
1931299Factored
FactorDigitsBitsDate
669941272458783027726459519832995.82016-09-10 04:01:01
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Philipp Hänggi58D87BDD13C4044A0
Verified (Factored)1999-04-02John Wyszynski58D87BDD13C4044A449585
Verified (Factored)2015-07-10MadPoo58D87BDD13C4044A174137
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-05Oliver KruseDB86CA9F0FFB5C841013
Verified2017-11-10Chang Chia-TcheDB86CA9F0FFB5C84149706913
P-1 factors
DateFactorB1B2
2016-09-10669941272458783027726459519834400000130000000
History
DateUserTypeResult
2017-11-10Chang Chia-TcheC-PRP
M1931299/66994127245878302772645951983 : DB86CA9F0FFB5C84
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1931299/66994127245878302772645951983 : DB86CA9F0FFB5C84
PRP: Verified
PRP without proof (not generated)
2016-09-10mikrF-PM1
Factor: 66994127245878302772645951983 / (P-1, B1=4400000, B2=130000000, E=12)
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-10-08Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-09-04ramgeisNF
no factor from 2^65 to 2^66
2015-07-10MadPooC-LL
58D87BDD13C4044A
2015-05-18lycornNF
no factor from 2^64 to 2^65
2015-05-18lycornNF
no factor from 2^63 to 2^64
2012-01-24markrNF-PM1
B1=275000, B2=6000000, E=12
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-02-06S485122NF
no factor from 2^60 to 2^61