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
266239Composite: 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 = 111000000
B2 = 4558908444090
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000765 / 1566
Estimated T-Level: 32.4 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski5450
VerifiedUnknown05450
VerifiedBrian J. BeesleyA5237FC5F3B705450
VerifiedEivind TrielA5237FC5F3B7054581145
Verified2001-10-27Brian J. BeesleyA5237FC5F3B70545126713
History
DateUserTypeResult
2025-02-27tim sNF
no factor from 2^66 to 2^67
2023-09-04masserNF-PP1
Start=147/17, B1=20000000, B2=1580000000
2023-09-02masserNF-PP1
Start=6/5, B1=20000000, B2=1580000000
2022-06-09Sid & AndyNF-PM1
B1=111000000, B2=4558908444090
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2021-06-30George WoltmanNF-PP1
Start=2/7, B1=20000000, B2=1660000000
2020-01-03Gordon SpenceNF
no factor from 2^65 to 2^66
2018-03-24BloodERazorNF
no factor from 2^64 to 2^65
2016-07-18JossNF-PM1
B1=39444451, B2=788889020, E=12
2016-01-21JossNF-PM1
B1=39444451, B2=394444510, E=12
2015-12-07Gordon SpenceNF
no factor from 2^63 to 2^64
2015-12-07Gordon SpenceNF
no factor from 2^62 to 2^63
2015-08-25NRNF
no factor from 2^61 to 2^62
2013-10-14David CampeauNF-PM1
B1=2450000, B2=68600000, E=12
2013-07-09lycornNF
no factor from 2^60 to 2^61
2012-02-26JossNF-PM1
B1=2309578
2011-02-15JossNF-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