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

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Exponent Range:










MnStatusDetails
699211Factored
FactorDigitsBitsDate
2582206795463732784327314472787.72021-12-17 23:42:55
ECM
DigitsB1Curves
2550000280 / 280
30250000147 / 640
Estimated T-Level: 26.1 ⓘ
TF below 2^82 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski27CC0
Verified (Factored)Ken Kriesel95035AB9815B67CC0
Verified (Factored)Klaus Kastens95035AB9815B67CC405161
Verified (Factored)2015-04-11MadPoo95035AB9815B67CC239405
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-12-18Tucker KaoE3C863EDA1AA2D1E151979053
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2021-12-18Section 31CERT
PRP Certification
Proof certified good
2021-12-18Tucker KaoC-PRP
M699211/258220679546373278432731447 : E3C863EDA1AA2D1E
PRP proof power = 6
PRP: Verified
Proof certified good
2021-12-17mnd9F-ECM
Factor: 258220679546373278432731447 / (ECM curve 4, B1=250000, B2=25000000, Sigma=611876846319084)
2020-01-10Gordon SpenceNF
no factor from 2^66 to 2^67
2017-08-18Smok_bmv NF
no factor from 2^65 to 2^66
2015-04-11MadPooC-LL
95035AB9815B67CC
2015-04-08lycornNF
no factor from 2^64 to 2^65
2015-04-08lycornNF
no factor from 2^61 to 2^64
2012-06-09alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2012-02-17JossNF-PM1
B1=528336
2011-07-19JossNF-PM1
B1=317002
2010-06-29Architects CubedNF
no factor from 2^60 to 2^61
2008-10-14Sturle SundeNF
no factor from 2^59 to 2^60
2008-10-14Sturle SundeNF
no factor from 2^58 to 2^59