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

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Exponent Range:










MnStatusDetails
2305781Factored
FactorDigitsBitsDate
625443955548535197264168492685.72017-08-24 23:29:30
ECM
DigitsB1Curves
255000083 / 280
Estimated T-Level: 21.5 ⓘ
TF below 2^66 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Ray StroubleFCA382BE37E578960
Verified (Factored)John GuinFCA382BE37E578960
Verified (Factored)1999-03-01Ben MathewsFCA382BE37E578961732689
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-11Oliver KruseE44C74F04C5B796B1013
Verified2017-11-22storm5510E44C74F04C5B796B1172316313
History
DateUserTypeResult
2021-06-11ViliamFNF-PM1
B1=5000000, B2=505000000
2018-02-19alpertronNF-PM1
B1=500000, B2=15000000, E=12
2017-11-22storm5510C-PRP
M2305781/62544395554853519726416849 : E44C74F04C5B796B
PRP: Verified
PRP without proof (not generated)
2017-10-11Oliver KruseC-PRP
M2305781/62544395554853519726416849 : E44C74F04C5B796B
PRP: Verified
PRP without proof (not generated)
2017-08-24bamF-ECM
Factor: 62544395554853519726416849 / (ECM curve 1, B1=50000, B2=5000000)
2017-05-30Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2015-10-22ramgeisNF
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
2013-01-23dbaughNF
no factor from 2^62 to 2^63
2012-05-13Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-02-12BudNF-PM1
B1=500000, B2=10000000, E=12
2009-01-14Sturle SundeNF
no factor from 2^60 to 2^61