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
8121871Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 273
TF target 267
P-1
B1 = 5197000
B2 = 34078022550
ECM
DigitsB1Curves
25500006 / 280
Estimated T-Level: 20.1 ⓘ
LL
StatusDateUserResidueShift
Verified2000-10-22Ivan RodionovC172D65B09FB678C5622172
Verified2002-08-03manfred zeckC172D65B09FB678C3332452
History
DateUserTypeResult
2025-06-01Jason LynchNF-PM1
B1=5197000, B2=34078022550
2022-09-04FlaukrotistNF
no factor from 2^72 to 2^73
2021-11-28FlaukrotistNF-PM1
B1=5000000, B2=180000000
2021-10-13SRBaseNF
no factor from 2^71 to 2^72
2021-08-26SRBaseNF
no factor from 2^70 to 2^71
2021-08-19SRBaseNF
no factor from 2^69 to 2^70
2019-12-02mnd9NF
no factor from 2^68 to 2^69
2018-07-04chuenkitNF
no factor from 2^67 to 2^68
2015-11-30snme2pm1NF
no factor from 2^66 to 2^67
2015-05-25snme2pm1NF
no factor from 2^65 to 2^66
2014-01-02David CampeauNF
no factor from 2^64 to 2^65
2013-09-15AxelssonNF
no factor from 2^63 to 2^64
2012-10-17NesowaNF-PM1
B1=100000, B2=1975000, E=6