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

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MnStatusDetails
3700987Factored
FactorDigitsBitsDate
3728694025430656531318312478.32023-05-18 14:55:10
ECM
DigitsB1Curves
255000079 / 280
Estimated T-Level: 21.4 ⓘ
TF below 2^66 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Jason MayfieldFD63174A14EF51260
Verified (Factored)1999-08-07Rob SimonsFD63174A14EF51261141416
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2023-05-24PerigC00E694FAF2619AD151013453
History
DateUserTypeResult
2023-05-24James HeinrichCERT
PRP Certification
Proof certified good
2023-05-24PerigC-PRP
M3700987/372869402543065653131831 : C00E694FAF2619AD
PRP proof power = 7
PRP: Verified
Proof certified good
2023-05-18Sergey NosovF-ECM
Factor: 372869402543065653131831 / (ECM curve 25, B1=50000, B2=5000000)
2021-04-19axnNF-PM1
B1=14000000, B2=700000000
2021-03-01axnNF
no factor from 2^69 to 2^70
2020-12-15axnNF
no factor from 2^68 to 2^69
2019-01-21TJAOINF
no factor from 2^67 to 2^68
2016-10-29Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2016-02-22ramgeisNF
no factor from 2^65 to 2^66
2015-01-20VictordeHollanderNF
no factor from 2^64 to 2^65
2015-01-20VictordeHollanderNF
no factor from 2^63 to 2^64
2012-11-27Squeeky_SquirrelNF-PM1
B1=235000, B2=5581250, E=12
2012-04-19GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-04-07Grant McCrackenNF
no factor from 2^61 to 2^62
2009-07-03Carsten KossendeyNF-PM1
B1=20000, B2=260000
2009-03-07S485122NF
no factor from 2^60 to 2^61