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

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Exponent Range:










MnStatusDetails
273233Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 267
TF target 244
TF below 2^103 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 141000000
B2 = 3268208233290
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000828 / 1566
Estimated T-Level: 32.6 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski36330
VerifiedUnknown36330
VerifiedBrian J. BeesleyB7A136D65274B6330
VerifiedEivind TrielB7A136D65274B633210378
Verified2001-11-17Brian J. BeesleyB7A136D65274B633167999
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-08-25-Anonymous-factor ECM small0.00 % 2025-08-25
History
DateUserTypeResult
2024-07-29tim 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=163/41, B1=20000000, B2=620000000
2023-01-27masserNF-PP1
Start=2/7, B1=20000000, B2=620000000
2022-06-16Sid & AndyNF-PM1
B1=141000000, B2=3268208233290
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
2012-10-16alpertronNF-PM1
B1=100000000, B2=2000000000, E=12
2012-02-26JossNF-PM1
B1=2233218
2011-02-19JossNF-PM1
B1=2000000
2009-01-23Sturle SundeNF
no factor from 2^59 to 2^60
2009-01-01Sturle SundeNF
no factor from 2^58 to 2^59