Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
84003973Tested as composite (unverified): unconfirmed Lucas-Lehmer test says not-prime
TF
No factors below 276
TF target 275
P-1
B1 = 670000
B2 = 12897500
LL
StatusDateUserResidueShift
Unverified2019-03-25Rob SartainD15B038913AB6F__39956076
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-07-28-Anonymous-LL double-check0.00 % 2025-07-28
History
DateUserTypeResult
2019-03-25Rob SartainC-LL
D15B038913AB6F__
2017-04-20kurlyNF-PM1
B1=670000, B2=12897500, E=6
2017-03-26TheJudgerNF
no factor from 2^75 to 2^76
2017-02-05Brian BeuningNF
no factor from 2^74 to 2^75
2017-02-03RichD0NF
no factor from 2^73 to 2^74
2016-09-02Gordon BowerNF
no factor from 2^72 to 2^73
2016-09-02Gordon BowerNF
no factor from 2^71 to 2^72
2013-08-25-Anonymous-NF
no factor from 2^70 to 2^71
2013-07-12Norman LeyNF
no factor from 2^69 to 2^70
2013-02-22ANONYMOUSNF
no factor from 2^68 to 2^69
2013-02-21SMoffatNF
no factor from 2^67 to 2^68
2012-04-23c10ck3rNF
no factor from 2^66 to 2^67
2011-06-12riccardo ubertiNF
no factor from 2^65 to 2^66
2010-12-22Architects CubedNF
no factor from 2^64 to 2^65