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

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Exponent Range:










MnStatusDetails
2580421Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 270
TF target 263
TF below 2^81 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 10000000
B2 = 10050107760
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 640
Estimated T-Level: 25.8 ⓘ
LL
StatusDateUserResidueShift
VerifiedChristopher Lund811AAE7AFC50D3C80
Verified1999-04-13Ethan O'Connor811AAE7AFC50D3C8214481
Verified2018-06-19kkmrkkblmbrbk811AAE7AFC50D3C82575310
History
DateUserTypeResult
2025-04-15JossNF-PM1
B1=10000000, B2=10050107760
2024-04-26TJAOINF
no factor from 2^69 to 2^70
2023-01-17Architects CubedNF-PM1
B1=5000000, B2=8646469650
2021-07-12TJAOINF
no factor from 2^68 to 2^69
2019-06-28lycornNF
no factor from 2^67 to 2^68
2018-06-19kkmrkkblmbrbkC-LL
811AAE7AFC50D3C8
2017-08-20Gordon SpenceNF
no factor from 2^66 to 2^67
2016-07-18mikrNF-PM1
B1=3200000, B2=112000000, E=12
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-11-08ramgeisNF
no factor from 2^65 to 2^66
2015-02-27VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-27VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-14dbaughNF
no factor from 2^62 to 2^63
2012-06-20Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-10-10markrNF-PM1
B1=175000, B2=4112500, E=6
2011-01-12JossNF-PM1
B1=50000
2010-12-21JossNF-PM1
B1=20000
2009-01-30Sturle SundeNF
no factor from 2^60 to 2^61