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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MnDetails
7678859
Composite, with 1 known prime factor. Cofactor is composite.
Trial Factored to 269
TF target 267
Factored
FactorDigitsBitsDate
260811762522508598372558831692994.42020-06-06 13:17:53
P-1 factors
DateFactorsB1B2
2020-06-0626081176252250859837255883169
721165721165
ECM
DigitsB1Curves
25500006 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
FactoredPaul Victor Novarese159B85826A6675F00Mlucas,Ernst Mayer,v2.5 and later,(aka E2)
Factored1999-07-27Alan Vidmar159B85826A6675F00Windows,Prime95,v16,NT service,(aka WS5)
Factored2015-11-15MadPoo 🙂159B85826A6675F05924613Windows 64-bit,Prime95,v26,(aka We4)
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
PRP without proof (not generated)
2020-06-09fre_games1D22F60ABF435C0D1588359553
Verified
PRP without proof (not generated)
2020-06-10marssystems1D22F60ABF435C0D1250062953
History
DateUserTypeResult
2025-05-08Stef42NF-PM1B1=1050000, B2=1233277500
2020-06-10marssystemsC-PRP
M7678859/26081176252250859837255883169 : 1D22F60ABF435C0D
2020-06-09fre_gamesC-PRP
M7678859/26081176252250859837255883169 : 1D22F60ABF435C0D
2020-06-06GdSF-PM1Factor: 26081176252250859837255883169 / B1=721165
2020-03-13TJAOINFno factor TF: 68-69
2018-07-31ramgeisNFno factor TF: 67-68
2016-09-19Gordon SpenceNFno factor TF: 66-67
2015-11-15MadPoo 🙂C-LL159B85826A6675F0
2015-06-12VictordeHollanderNFno factor TF: 65-66
2013-12-09David CampeauNFno factor TF: 64-65
2013-10-11NesowaNFno factor TF: 63-64
2012-09-18NesowaNF-PM1B1=95000, B2=1757500, E=6
2009-07-08Carsten KossendeyNF-PM1B1=45000, B2=686250, E=6
1999-07-27vidmarC-LL159B85826A6675F0
1998-08-09-anonymous-NFno factor TF: 1-63
1998-08-09-anonymous-NFno factor TF: 1-62
1998-08-02-anonymous-NFno factor TF: 1-61