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

PrimeNet Exponent Status

Exponent Range:





MnDetails
81307409
Composite: proven not-prime with Lucas-Lehmer test
No factors below 276
TF target 275
P-1
B1 = 650000
B2 = 12675000
LL
StatusDateUserResidueShiftSoftware
Verified2017-05-05Michael HanschoF1BDCCC3B8DFC8E327353526Linux 64-bit,Prime95,v28.10,build 1
Verified2026-07-28PoaoF1BDCCC3B8DFC8E3983006Linux 64-bit,Prime95,v30.19,build 20
Verified2026-07-30Torchwood InstituteF1BDCCC3B8DFC8E363166705Windows 64-bit,Prime95,v30.5,build 2
History
DateUserTypeResult
2026-07-30Torchwood InstituteC-LL
F1BDCCC3B8DFC8E3
2026-07-28PoaoC-LL
F1BDCCC3B8DFC8E3
2017-05-05Michael HanschoC-LL
F1BDCCC3B8DFC8E3
2016-09-23Judge HaleNF-PM1B1=650000, B2=12675000, E=12
2016-09-15dh1NFno factor TF: 75-76
2016-09-15dh1NFno factor TF: 74-75
2016-09-15dh1NFno factor TF: 73-74
2016-09-15dh1NFno factor TF: 72-73
2016-09-15dh1NFno factor TF: 71-72
2014-03-03driveByUpgradesNFno factor TF: 70-71
2013-02-15Jean-Pierre LaurinNFno factor TF: 69-70
2013-02-15Jean-Pierre LaurinNFno factor TF: 68-69
2013-02-13Simon HarrisonNFno factor TF: 67-68
2013-01-30phoenicisNFno factor TF: 66-67
2012-08-10Carsten KossendeyNFno factor TF: 65-66
2010-12-03Architects CubedNFno factor TF: 64-65