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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
4061251Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 272
TF target 265
TF below 2^74 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 6200000
B2 = 26931564660
ECM
DigitsB1Curves
2550000205 / 280
Estimated T-Level: 23.7 ⓘ
LL
StatusDateUserResidueShift
VerifiedAnthony Mack3216147FB2577AE60
Verified2000-08-17Gregor Schwan3216147FB2577AE61215740
History
DateUserTypeResult
2025-03-08Andrew BNF
no factor from 2^71 to 2^72
2022-09-20DRobinsonPENF-PM1
B1=6200000, B2=26931564660
2022-04-08mikrNF
no factor from 2^70 to 2^71
2021-06-25ATHNF-PP1
Start=2/7, B1=2500000, B2=172500000
2021-01-05mikrNF
no factor from 2^69 to 2^70
2021-01-05mikrNF
no factor from 2^68 to 2^69
2018-12-22Ismo LaitelaNF-PM1
B1=2237739, B2=62656681, E=12
2018-11-03YxinityNF
no factor from 2^67 to 2^68
2016-09-27kkmrkkblmbrbkNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-05-21snme2pm1NF
no factor from 2^65 to 2^66
2013-10-21David CampeauNF
no factor from 2^64 to 2^65
2013-08-20JayderNF
no factor from 2^63 to 2^64
2013-07-04Squeeky_SquirrelNF-PM1
B1=120000, B2=2310000, E=6
2011-07-24USAFSSNF-PM1
B1=40000, B2=580000
2011-07-01GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-10-19Grant McCrackenNF
no factor from 2^61 to 2^62
2009-07-17Carsten KossendeyNF-PM1
B1=20000, B2=300000