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

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MnStatusDetails
2462531Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
1423448741174043440812166.92017-07-16 22:18:21
ECM
DigitsB1Curves
2550000153 / 280
Estimated T-Level: 22.7 ⓘ
TF below 2^71 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Laurent Desnogues31B27EE3C92775510
Verified (Factored)Robert L Einkauf31B27EE3C92775510
Verified (Factored)1999-05-16Stephen Spencer31B27EE3C9277551952001
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-28alpertronE191F98223844C0F1013
Verified2017-11-05Oliver KruseE191F98223844C0F198863413
History
DateUserTypeResult
2018-09-28alpertronNF-PM1
B1=2000000, B2=60000000, E=12
2017-11-05Oliver KruseC-PRP
M2462531/142344874117404344081 : E191F98223844C0F
PRP: Verified
PRP without proof (not generated)
2017-09-28alpertronC-PRP
M2462531/142344874117404344081 : E191F98223844C0F
PRP: Verified
PRP without proof (not generated)
2017-07-16Gordon SpenceF
Factor: 142344874117404344081 / TF: 66-67
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-10-26ramgeisNF
no factor from 2^65 to 2^66
2015-03-03VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-03VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-19mikrNF-PM1
B1=2382500, B2=85770100, E=12
2014-09-02JossNF-PM1
B1=121064
2013-12-04Jerry HallettNF
no factor from 2^62 to 2^63
2012-06-07Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-20Oscar ÖstlinNF-PM1
B1=95000, B2=1947500, E=6
2010-11-19JossNF-PM1
B1=20000
2009-01-14Sturle SundeNF
no factor from 2^60 to 2^61