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:










MnStatusDetails
274591Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 267
TF target 244
TF below 2^102 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 140000000
B2 = 3243068168340
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000674 / 1566
Estimated T-Level: 32.2 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski285E0
VerifiedUnknown285E0
VerifiedBrian J. Beesley1741A5831BF0A85E0
VerifiedEivind Triel1741A5831BF0A85E153961
Verified2001-11-17Brian J. Beesley1741A5831BF0A85E201419
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-10-04-Anonymous-factor ECM small0.00 % 2025-10-04
2025-09-24-Anonymous-factor ECM small0.00 % 2025-09-24
History
DateUserTypeResult
2024-10-02tim sNF
no factor from 2^66 to 2^67
2023-02-05masserNF-PP1
Start=6/5, B1=20000000, B2=620000000
2023-01-28masserNF-PP1
Start=88/59, B1=20000000, B2=620000000
2023-01-27masserNF-PP1
Start=2/7, B1=20000000, B2=620000000
2022-06-18Sid & AndyNF-PM1
B1=140000000, B2=3243068168340
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2020-01-05Gordon SpenceNF
no factor from 2^65 to 2^66
2018-03-24Gordon SpenceNF
no factor from 2^64 to 2^65
2016-02-02Gordon SpenceNF
no factor from 2^63 to 2^64
2016-02-02Gordon SpenceNF
no factor from 2^62 to 2^63
2015-08-13NRNF
no factor from 2^61 to 2^62
2013-07-07lycornNF
no factor from 2^60 to 2^61
2012-11-06alpertronNF-PM1
B1=100000000, B2=2000000000, E=12
2012-02-26JossNF-PM1
B1=2218908
2011-07-24JossNF-PM1
B1=1775126
2011-06-26JossNF-PM1
B1=1065075
2009-01-25Sturle SundeNF
no factor from 2^59 to 2^60
2009-01-02Sturle SundeNF
no factor from 2^58 to 2^59