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
285517Composite: 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 = 145000000
B2 = 2974151380200
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000653 / 1566
Estimated T-Level: 32.1 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski9930
VerifiedUnknown09930
VerifiedBrian J. BeesleyEBEF1AAC0C8189930
VerifiedEivind TrielEBEF1AAC0C81899347872
Verified2002-03-03Brian J. BeesleyEBEF1AAC0C818993118555
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-10-12-Anonymous-factor ECM small0.00 % 2025-10-12
2025-10-11-Anonymous-factor ECM small0.00 % 2025-10-11
2025-10-08-Anonymous-factor ECM small0.00 % 2025-10-08
History
DateUserTypeResult
2024-11-18tim 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=129/19, B1=20000000, B2=620000000
2023-01-27masserNF-PP1
Start=2/7, B1=20000000, B2=620000000
2022-07-02Sid & AndyNF-PM1
B1=145000000, B2=2974151380200
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2019-12-03Gordon SpenceNF
no factor from 2^65 to 2^66
2019-05-11alexNF-PM1
B1=100000000, B2=2000000000, E=12
2016-03-25YxinityNF
no factor from 2^64 to 2^65
2016-01-06Gordon SpenceNF
no factor from 2^63 to 2^64
2016-01-06Gordon SpenceNF
no factor from 2^62 to 2^63
2015-08-25NRNF
no factor from 2^61 to 2^62
2013-06-25lycornNF
no factor from 2^60 to 2^61
2012-08-09markrNF-PM1
B1=10000000, B2=500000000, E=12
2012-08-06markrNF-PM1
B1=10000000, B2=400000000, E=12
2011-02-20JossNF-PM1
B1=2000000
2009-01-24Sturle SundeNF
no factor from 2^59 to 2^60
2009-01-02Sturle SundeNF
no factor from 2^58 to 2^59