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

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MnStatusDetails
1828637Factored
FactorDigitsBitsDate
639281022890198327796972375.82019-11-30 11:58:21
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)David LintonF2604209E420DEED0
Verified (Factored)1999-01-02Roy MillerF2604209E420DEED1157865
Verified (Factored)2015-07-18MadPooF2604209E420DEED1624261
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2019-11-30mnd983499771E2C88B81166436653
Verified2019-11-30ATH83499771E2C88B811163821253
History
DateUserTypeResult
2019-11-30ATHC-PRP
M1828637/63928102289019832779697 : 83499771E2C88B81
PRP: Verified
PRP without proof (not generated)
2019-11-30mnd9C-PRP
M1828637/63928102289019832779697 : 83499771E2C88B81
PRP: Verified
PRP without proof (not generated)
2019-11-30KeysarecoolF-ECM
Factor: 63928102289019832779697 / (ECM curve 2, B1=50000, B2=5000000, Sigma=5754645767743516)
2019-06-24TJAOINF
no factor from 2^67 to 2^68
2018-05-03JossNF-PM1
B1=1828637, B2=182863700, E=12
2018-04-16TJAOINF
no factor from 2^66 to 2^67
2018-02-27JossNF-PM1
B1=1828637, B2=109486080, E=12
2018-02-10JossNF-PM1
B1=1828637, B2=54743040, E=12
2018-02-04JossNF-PM1
B1=1828637, B2=27371520, E=12
2018-01-16JossNF-PM1
B1=1828637, B2=13685760, E=12
2017-03-20JossNF-PM1
B1=1368576, B2=13685760, E=12
2016-11-03JossNF-PM1
B1=1140480
2016-10-29JossNF-PM1
B1=792000
2016-10-27JossNF-PM1
B1=660000
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-10-06Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-09-04ramgeisNF
no factor from 2^65 to 2^66
2015-07-18MadPooC-LL
F2604209E420DEED
2015-04-25snme2pm1NF
no factor from 2^64 to 2^65
2015-04-25snme2pm1NF
no factor from 2^63 to 2^64
2011-12-31markrNF-PM1
B1=275000, B2=6000000, E=12
2011-03-08GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-04-10Architects CubedNF
no factor from 2^60 to 2^61