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
261127Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 267
TF target 244
TF below 2^105 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 237200000
B2 = 2733132041640
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000970 / 1566
Estimated T-Level: 33.1 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski43F40
VerifiedUnknown43F40
VerifiedBrian J. BeesleyC27AE14DC2D143F40
VerifiedEivind TrielC27AE14DC2D143F4215860
Verified2001-10-20Brian J. BeesleyC27AE14DC2D143F4171187
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-10-05-Anonymous-factor ECM small0.00 % 2025-10-05
2025-10-05-Anonymous-factor ECM small0.00 % 2025-10-05
2025-10-04-Anonymous-factor ECM small0.00 % 2025-10-04
History
DateUserTypeResult
2024-08-04tim sNF
no factor from 2^66 to 2^67
2023-02-07masserNF-PP1
Start=6/5, B1=20000000, B2=620000000
2023-01-30masserNF-PP1
Start=89/31, B1=20000000, B2=620000000
2023-01-27masserNF-PP1
Start=2/7, B1=20000000, B2=620000000
2022-12-08Sid & AndyNF-PM1
B1=237200000, B2=2733132041640
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2022-02-11lycornNF-PM1
B1=17000000, B2=502035984450
2020-01-02Gordon SpenceNF
no factor from 2^65 to 2^66
2018-03-18Gordon SpenceNF
no factor from 2^64 to 2^65
2015-12-05Gordon SpenceNF
no factor from 2^63 to 2^64
2015-12-05Gordon SpenceNF
no factor from 2^62 to 2^63
2015-08-26NRNF
no factor from 2^61 to 2^62
2015-02-26David CampeauNF-PM1
B1=17000000, B2=765000000, E=12
2013-10-21David CampeauNF-PM1
B1=2395000, B2=81430000, E=12
2013-07-12lycornNF
no factor from 2^60 to 2^61
2012-02-26JossNF-PM1
B1=2368372
2011-02-11JossNF-PM1
B1=2000000
2009-01-24Sturle SundeNF
no factor from 2^59 to 2^60
2008-12-31Sturle SundeNF
no factor from 2^58 to 2^59