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

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MnDetails
7605379
Composite, with 1 known prime factor. Cofactor is composite.
Trial Factored to 269
TF target 267
Factored
FactorDigitsBitsDate
1698188040135011536417155372787.12020-05-04 01:36:51
P-1 factors
DateFactorsB1B2
2020-05-04169818804013501153641715537
100000020000000
ECM
DigitsB1Curves
25500006 / 280
Estimated T-Level: 20.1
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
Factored1999-08-07Miall CediloteE488261D7241B2820Windows,Prime95,v18,(aka WU1)
Factored2002-03-31Mark R CoffeyE488261D7241B2827201588Windows,Prime95,v21,(aka WX1)
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors
ShiftTypeBase
Verified
PRP without proof (not generated)
2020-05-04riccardo ubertiC56F8E3C32BBB5EE185236253
Verified
PRP without proof (not generated)
2020-05-10Chang Chia-TcheC56F8E3C32BBB5EE1485016053
History
DateUserTypeResult
2020-05-10Chang Chia-TcheC-PRPM7605379/169818804013501153641715537 : C56F8E3C32BBB5EE
2020-05-04riccardo ubertiC-PRPM7605379/169818804013501153641715537 : C56F8E3C32BBB5EE
2020-05-04ThaF-PM1Factor: 169818804013501153641715537 / B1=1000000, B2=20000000
2020-03-20TJAOINFno factor TF: 68-69
2018-07-31ramgeisNFno factor TF: 67-68
2016-09-11Gordon SpenceNFno factor TF: 66-67
2015-06-09VictordeHollanderNFno factor TF: 65-66
2013-12-20David CampeauNFno factor TF: 64-65
2013-10-11NesowaNFno factor TF: 63-64
2012-07-25NesowaNF-PM1B1=95000, B2=1757500, E=6
2002-03-31-anonymous-C-LLE488261D7241B282
2002-03-10-anonymous-NF-PM1B1=40000, B2=560000
1999-08-07-anonymous-C-LLE488261D7241B282
1998-08-09-anonymous-NFno factor TF: 1-62
1998-08-09-anonymous-NFno factor TF: 1-63