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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
3261473Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 271
TF target 264
TF below 2^81 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 10000000
B2 = 25651066350
ECM
DigitsB1Curves
2550000280 / 280
30250000116 / 640
Estimated T-Level: 25.9 ⓘ
LL
StatusDateUserResidueShift
VerifiedThomas Honold57EDBE0D89FE217F0
Verified1999-10-07Yew Jin Lim57EDBE0D89FE217F1980990
History
DateUserTypeResult
2025-06-30Architects CubedNF
no factor from 2^70 to 2^71
2023-06-08Sid & AndyNF-PM1
B1=10000000, B2=25651066350
2022-08-01TJAOINF
no factor from 2^69 to 2^70
2021-06-07TJAOINF
no factor from 2^68 to 2^69
2021-01-29axnNF-PM1
B1=10000000, B2=400000000
2020-09-26mikrNF-PM1
B1=4000000, B2=150000000, E=12
2019-01-07TJAOINF
no factor from 2^67 to 2^68
2017-04-04Gordon SpenceNF
no factor from 2^66 to 2^67
2016-01-20JossNF-PM1
B1=415800, B2=4158000, E=6
2015-06-28ThaNF
no factor from 2^65 to 2^66
2015-02-18VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-18VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-07JossNF-PM1
B1=99360
2014-06-13JossNF-PM1
B1=79680
2012-12-30dbaughNF
no factor from 2^62 to 2^63
2011-11-04markrNF
no factor from 2^61 to 2^62
2011-09-15USAFSSNF-PM1
B1=60000, B2=1050000, E=6
2009-07-06Carsten KossendeyNF-PM1
B1=15000, B2=191250
2009-04-04S485122NF
no factor from 2^60 to 2^61