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

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MnStatusDetails
1961347Factored
FactorDigitsBitsDate
73027000805564799953532272.62020-01-09 05:01:51
ECM
DigitsB1Curves
2550000273 / 280
Estimated T-Level: 24.9
TF below 2^78 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Allan SchrumA62C6363B475977C0
Verified (Factored)1999-03-26Philip HeedeA62C6363B475977C356444
Verified (Factored)2015-06-28MadPooA62C6363B475977C800476
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-01-09Christoph Zenger093C1ABC5A5AD07E1172716253
Verified2020-01-10Chang Chia-Tche093C1ABC5A5AD07E1154921053
History
DateUserTypeResult
2020-01-10Chang Chia-TcheC-PRP
M1961347/7302700080556479995353 : 093C1ABC5A5AD07E
PRP: Verified
PRP without proof (not generated)
2020-01-09Christoph ZengerC-PRP
M1961347/7302700080556479995353 : 093C1ABC5A5AD07E
PRP: Verified
PRP without proof (not generated)
2020-01-09mnd9F-ECM
Factor: 7302700080556479995353 / (ECM curve 1, B1=50000, B2=5000000, Sigma=8573018363030315)
2019-05-14chuenkitNF
no factor from 2^67 to 2^68
2018-11-26JossNF-PM1
B1=1961347, B2=245168375, E=12
2018-05-16JossNF-PM1
B1=1961347, B2=196134700, E=12
2018-03-04JossNF-PM1
B1=1961347, B2=120000000, E=12
2018-02-13JossNF-PM1
B1=1961347, B2=60000000, E=12
2018-01-29JossNF-PM1
B1=1961347, B2=30000000, E=12
2018-01-08TJAOINF
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
2015-09-08ramgeisNF
no factor from 2^65 to 2^66
2015-06-28MadPooC-LL
A62C6363B475977C
2015-04-19lycornNF
no factor from 2^64 to 2^65
2015-04-19lycornNF
no factor from 2^63 to 2^64
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-04-13kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2010-01-09S485122NF
no factor from 2^60 to 2^61