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
81648221
Tested as composite (unverified): unconfirmed Lucas-Lehmer test says not-prime
No factors below 276
TF target 275
Assignments
AssignedUserWork TypeStage% DoneUpdatedEst CompleteExpired
2026-07-13KrieselDLL81.39 %2026-08-272026-09-01
P-1
B1 = 5400000
B2 = 5400812340
LL
StatusDateUserResidueShiftSoftware
Unverified2017-10-10SysConsult4DB67B0A2C6521__60975562Windows Service,Prime95,v27.7,build 2
History
DateUserTypeResult
2026-08-26EnsigmaNF-PM1B1=5400000, B2=5400812340
2026-08-25EnsigmaNF-PM1B1=5400000, B2=2700766530
2026-08-25EnsigmaNF-PM1B1=5400000, B2=1800109080
2026-02-13Kyle AskineNFno factor TF: 75-76
2024-05-05James HeinrichNFno factor TF: 69-70
2017-10-10SysConsultC-LL4DB67B0A2C6521__
2016-11-06TheJudgerNF-PM1B1=695000, B2=14247500, E=12
2016-10-27-anonymous-NFno factor TF: 74-75
2016-10-27-anonymous-NFno factor TF: 73-74
2016-10-27-anonymous-NFno factor TF: 72-73
2016-10-27-anonymous-NFno factor TF: 71-72
2014-08-16tmorrowNFno factor TF: 70-71
2014-04-09lindedNFno factor TF: 69-70
2014-04-07A_SavchenkoNFno factor TF: 68-69
2014-04-03g0bNFno factor TF: 67-68
2013-01-30phoenicisNFno factor TF: 66-67
2011-02-28Ujjwal ChaliseNFno factor TF: 65-66
2010-12-10Architects CubedNFno factor TF: 64-65