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

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MnStatusDetails
3248041Factored
FactorDigitsBitsDate
4431387149366679258172168.62015-10-06 12:34:03
ECM
DigitsB1Curves
25500009 / 280
Estimated T-Level: 20.2 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Dax Prather08029A5E24C6F1300
Verified (Factored)1998-09-27Alexey Guzeev08029A5E24C6F1300
Verified (Factored)1999-06-26Cody DW Jones08029A5E24C6F130175
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-11-02kkmrkkblmbrbkF73C07D57AD2FBFF165092453
Verified2017-11-19Oliver KruseF73C07D57AD2FBFF1193958653
P-1 factors
DateFactorB1B2
2015-10-064431387149366679258171550004146250
History
DateUserTypeResult
2022-09-07JossNF-PM1
B1=1082680, B2=226749600
2022-04-18LordJuliusNF
no factor from 2^66 to 2^67
2022-04-18LordJuliusNF
no factor from 2^65 to 2^66
2022-04-18LordJuliusNF
no factor from 2^64 to 2^65
2022-04-18LordJuliusNF
no factor from 2^63 to 2^64
2022-04-18LordJuliusNF
no factor from 2^62 to 2^63
2022-04-18LordJuliusNF
no factor from 2^1 to 2^62
2022-01-24JossNF-PM1
B1=1082680, B2=119912100
2021-07-10JossNF
no factor from 2^67 to 2^68
2021-01-18JossNF-PM1
B1=324804, B2=3248041, E=6
2020-12-25JossNF-PM1
B1=108268
2017-11-19Oliver KruseC-PRP
M3248041/443138714936667925817 : F73C07D57AD2FBFF
PRP: Verified
PRP without proof (not generated)
2017-11-02kkmrkkblmbrbkC-PRP
M3248041/443138714936667925817 : F73C07D57AD2FBFF
PRP: Verified
PRP without proof (not generated)
2015-10-06Squeeky_SquirrelF-PM1
Factor: 443138714936667925817 / (P-1, B1=155000, B2=4146250, E=6)
2015-06-28ThaNF
no factor from 2^65 to 2^66
2015-02-18VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-18VictordeHollanderNF
no factor from 2^63 to 2^64
2014-09-29JossNF-PM1
B1=99522
2014-06-11JossNF-PM1
B1=79761
2012-12-30dbaughNF
no factor from 2^62 to 2^63
2011-09-26markrNF
no factor to 2^62
2011-09-10USAFSSNF-PM1
B1=60000, B2=1050000, E=6
2009-07-04Carsten KossendeyNF-PM1
B1=15000, B2=191250
2009-04-05S485122NF
no factor from 2^60 to 2^61