Marin Mersenne 2^P-1
Username
Password
Forgot password?
Blue
Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
7644529
Composite, with 1 known prime factor. Cofactor is composite.
Trial Factored to 269
TF target 267
Factored
FactorDigitsBitsDate
21168756819973241503792332580.82020-05-22 16:19:16
P-1 factors
DateFactorsB1B2
2020-05-222116875681997324150379233
3108096216181
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
Factored1999-10-29Stephen WoodC786713CF0661AD12847922Linux 32-bit,Prime95,v18,(aka WU2)
Factored2002-07-14Rick CummingsC786713CF0661AD12829399Windows,Prime95,v21,(aka WX1)
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
PRP without proof (not generated)
2020-05-24fre_games208BE430DEBDF8621566221553
Verified
PRP without proof (not generated)
2020-05-26daveward2005208BE430DEBDF8621656179953
History
DateUserTypeResult
2025-10-17Sid & AndyNF-PM1B1=2400000, B2=3901006200
2020-05-26daveward2005C-PRPM7644529/2116875681997324150379233 : 208BE430DEBDF862
2020-05-24fre_gamesC-PRPM7644529/2116875681997324150379233 : 208BE430DEBDF862
2020-05-22GdSF-PM1Factor: 2116875681997324150379233 / B1=310809, B2=6216181
2020-02-28TJAOINFno factor TF: 68-69
2018-07-31ramgeisNFno factor TF: 67-68
2016-09-16Gordon SpenceNFno factor TF: 66-67
2015-06-12VictordeHollanderNFno factor TF: 65-66
2013-12-05David CampeauNFno factor TF: 64-65
2013-10-11NesowaNFno factor TF: 63-64
2012-07-27NesowaNF-PM1B1=95000, B2=1757500, E=6
2002-07-14-anonymous-C-LLC786713CF0661AD1
2002-07-06-anonymous-NF-PM1B1=40000, B2=650000
1999-10-29Stephen WoodC-LLC786713CF0661AD1
1999-05-02-anonymous-NFno factor TF: 1-63
1999-02-07-anonymous-NFno factor TF: 1-62
1998-10-04Mark DNFno factor TF: 1-61