Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

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MnStatusDetails
2181331Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 269
TF target 262
TF below 2^82 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 28186690
B2 = 29049067320
ECM
DigitsB1Curves
2550000280 / 280
30250000166 / 640
Estimated T-Level: 26.3 ⓘ
LL
StatusDateUserResidueShift
VerifiedEthan Hansen538BA2086DFF08010
Verified1999-02-14Ethan O'Connor538BA2086DFF08011455979
Verified2018-04-13kkmrkkblmbrbk538BA2086DFF080130686
History
DateUserTypeResult
2025-01-22JossNF-PM1
B1=28186690, B2=29049067320
2022-12-28Architects CubedNF-PM1
B1=5000000, B2=9896994030
2021-07-15TJAOINF
no factor from 2^68 to 2^69
2019-04-22TJAOINF
no factor from 2^67 to 2^68
2018-04-13kkmrkkblmbrbkC-LL
538BA2086DFF0801
2018-01-23mikrNF-PM1
B1=2500000, B2=125000000, E=12
2016-11-24Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-01-04JossNF-PM1
B1=443433, B2=4434330, E=6
2016-01-02ramgeisNF
no factor from 2^65 to 2^66
2015-03-25VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-25VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-10JossNF-PM1
B1=148848
2014-06-26-Anonymous-NF-PM1
B1=119424
2013-09-13BloodIceNF
no factor from 2^62 to 2^63
2011-01-14markrNF-PM1
B1=90000, B2=1620000, E=6
2009-01-08Sturle SundeNF
no factor from 2^61 to 2^62
2009-01-02Sturle SundeNF
no factor from 2^60 to 2^61