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

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MnStatusDetails
1788373Factored
FactorDigitsBitsDate
3123505119262294529239992478.02020-01-28 06:49:36
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)Ed Knapton9ED8A05FABFEDAB80
Verified (Factored)1998-12-21John Carr9ED8A05FABFEDAB8155035
Verified (Factored)2015-07-18MadPoo9ED8A05FABFEDAB8623871
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-01-28Christoph ZengerD8DC656F8F6CA1AB1120997253
Verified2020-01-30Justine V.D8DC656F8F6CA1AB126617853
History
DateUserTypeResult
2020-01-30Justine V.C-PRP
M1788373/312350511926229452923999 : D8DC656F8F6CA1AB
PRP: Verified
PRP without proof (not generated)
2020-01-28Christoph ZengerC-PRP
M1788373/312350511926229452923999 : D8DC656F8F6CA1AB
PRP: Verified
PRP without proof (not generated)
2020-01-28mnd9F-ECM
Factor: 312350511926229452923999 / (ECM curve 1, B1=50000, B2=5000000, Sigma=2817843683731781)
2019-06-24TJAOINF
no factor from 2^67 to 2^68
2018-10-19JossNF-PM1
B1=1788373, B2=196721030, E=12
2018-07-02JossNF-PM1
B1=1788373, B2=178837300, E=12
2017-11-03TJAOINF
no factor from 2^66 to 2^67
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
2015-09-12ramgeisNF
no factor from 2^65 to 2^66
2015-07-18MadPooC-LL
9ED8A05FABFEDAB8
2015-06-13mikrNF-PM1
B1=2475400, B2=86660000, E=12
2015-05-15snme2pm1NF
no factor from 2^64 to 2^65
2015-05-15snme2pm1NF
no factor from 2^63 to 2^64
2014-09-19JossNF-PM1
B1=171780
2014-05-09JossNF-PM1
B1=135890
2014-04-10-Anonymous-NF-PM1
B1=100000
2011-02-10Carsten KossendeyNF-PM1
B1=95000, B2=1615000, E=6
2010-10-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-04-20Architects CubedNF
no factor from 2^60 to 2^61