Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:





MnDetails
2305781
Composite, with 1 known prime factor. Cofactor is composite.
Trial Factored to 268
TF target 262
Factored
FactorDigitsBitsDate
625443955548535197264168492685.72017-08-24 23:29:30
ECM
DigitsB1Curves
2550000280 / 280
30250000123 / 640
Estimated T-Level: 26.0 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
FactoredRay StroubleFCA382BE37E578960Windows,Prime95,v14,(aka WQ1)
FactoredJohn GuinFCA382BE37E578960Windows,Prime95,v14,(aka WQ1)
Factored1999-03-01Ben MathewsFCA382BE37E578961732689Windows,Prime95,v17,(aka WT1)
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
PRP without proof (not generated)
2017-10-11Oliver KruseE44C74F04C5B796B1013
Verified
PRP without proof (not generated)
2017-11-22storm5510E44C74F04C5B796B1172316313
History
DateUserTypeResult
2021-06-11ViliamFNF-PM1B1=5000000, B2=505000000
2018-02-19alpertronNF-PM1B1=500000, B2=15000000, E=12
2017-11-22storm5510C-PRPM2305781/62544395554853519726416849 : E44C74F04C5B796B
2017-10-11Oliver KruseC-PRPM2305781/62544395554853519726416849 : E44C74F04C5B796B
2017-08-24bamF-ECMFactor: 62544395554853519726416849
2017-05-30Gordon SpenceNFno factor TF: 66-67
2016-02-23Mark RoseNFno factor TF: 1-60
2015-10-22ramgeisNFno factor TF: 65-66
2015-03-03VictordeHollanderNFno factor TF: 64-65
2015-03-03VictordeHollanderNFno factor TF: 63-64
2013-01-23dbaughNFno factor TF: 62-63
2012-05-13Sebastian HornbostelNFno factor TF: 61-62
2010-02-12BudNF-PM1B1=500000, B2=10000000, E=12
2009-01-14Sturle SundeNFno factor TF: 60-61
2003-09-14-anonymous-NF-PM1B1=2048, B2=204800
1999-03-01-anonymous-C-LLFCA382BE37E57896