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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
4198921Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 272
TF target 265
TF below 2^80 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 6200000
B2 = 33322740360
ECM
DigitsB1Curves
2550000280 / 280
3025000063 / 640
Estimated T-Level: 25.5 ⓘ
LL
StatusDateUserResidueShift
Bad1998-03-31Brent Stone65B85A17352E8B160
Verified1999-12-08didier.ottDCDBF82B23A017301450372
Verified2001-03-05Robin TremblayDCDBF82B23A017302985846
History
DateUserTypeResult
2024-11-21bayanneNF
no factor from 2^71 to 2^72
2022-12-16DRobinsonPENF-PM1
B1=6200000, B2=33322740360
2022-06-04mikrNF
no factor from 2^70 to 2^71
2021-06-18axnNF
no factor from 2^69 to 2^70
2021-05-24TJAOINF
no factor from 2^68 to 2^69
2021-04-26Zhang RuichongNF-PM1
B1=500000, B2=20000000
2018-12-15YxinityNF
no factor from 2^67 to 2^68
2017-12-27YxinityNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-06-07snme2pm1NF
no factor from 2^65 to 2^66
2013-12-31Squeeky_SquirrelNF-PM1
B1=145000, B2=3371250, E=6
2013-11-13David CampeauNF
no factor from 2^64 to 2^65
2013-10-31JayderNF
no factor from 2^63 to 2^64
2011-10-27Squeeky_SquirrelNF-PM1
B1=70000, B2=1155000, E=6
2011-05-28GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-11-14Grant McCrackenNF
no factor from 2^61 to 2^62