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

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MnStatusDetails
1977631Factored
FactorDigitsBitsDate
66426885884301315611011372582.52020-08-02 15:00:53
ECM
DigitsB1Curves
2550000265 / 280
Estimated T-Level: 24.7
TF below 2^77 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Walt Armour0C3D53559188C0E80
Verified (Factored)1999-01-10King Butler0C3D53559188C0E8376167
Verified (Factored)2015-07-12MadPoo0C3D53559188C0E81256942
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-08-02riccardo ubertiBC7BBED0965F66AC163443953
Verified2020-08-03marssystemsBC7BBED0965F66AC1158174753
History
DateUserTypeResult
2020-08-03marssystemsC-PRP
M1977631/6642688588430131561101137 : BC7BBED0965F66AC
PRP: Verified
PRP without proof (not generated)
2020-08-02riccardo ubertiC-PRP
M1977631/6642688588430131561101137 : BC7BBED0965F66AC
PRP: Verified
PRP without proof (not generated)
2020-08-02GANF-ECM
Factor: 6642688588430131561101137 / (ECM curve 1, B1=50000, B2=5000000, Sigma=8478114576988776)
2018-11-26JossNF-PM1
B1=1977631, B2=247203875, E=12
2018-06-11ramgeisNF
no factor from 2^70 to 2^71
2018-05-28JossNF-PM1
B1=1977631, B2=197763100, E=12
2018-03-08YxinityNF
no factor from 2^69 to 2^70
2018-03-08YxinityNF
no factor from 2^68 to 2^69
2018-03-08YxinityNF
no factor from 2^67 to 2^68
2018-03-08YxinityNF
no factor from 2^66 to 2^67
2018-03-06JossNF-PM1
B1=1977631, B2=120000000, E=12
2018-02-14JossNF-PM1
B1=1977631, B2=60000000, E=12
2018-01-23JossNF-PM1
B1=1977631, B2=30000000, E=12
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-09-10ramgeisNF
no factor from 2^65 to 2^66
2015-07-12MadPooC-LL
0C3D53559188C0E8
2015-03-17lycornNF
no factor from 2^64 to 2^65
2015-03-17lycornNF
no factor from 2^63 to 2^64
2011-09-03GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-02-26kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2009-12-23S485122NF
no factor from 2^60 to 2^61