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
338893Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 268
TF target 244
TF below 2^105 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 85000000
B2 = 2708233958430
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000985 / 1566
Estimated T-Level: 33.1 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski12020
VerifiedUnknown12020
VerifiedGuillermo Ballester ValorCE008CC5E6BF92020
VerifiedEivind TrielCE008CC5E6BF9202296087
Verified2002-01-15Dennis PopeCE008CC5E6BF920212630
History
DateUserTypeResult
2023-09-09masserNF-PP1
Start=199/71, B1=20000000, B2=1580000000
2023-09-08masserNF-PP1
Start=6/5, B1=20000000, B2=1580000000
2023-07-05JacobZNF-PM1
B1=85000000, B2=2708233958430
2023-02-02JossNF-PM1
B1=1000000, B2=27892134270
2022-07-25Gordon SpenceNF
no factor from 2^67 to 2^68
2022-07-25Gordon SpenceNF
no factor from 2^66 to 2^67
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2021-06-22George WoltmanNF-PP1
Start=2/7, B1=30000000, B2=2670000000
2019-11-27Gordon SpenceNF
no factor from 2^65 to 2^66
2018-01-27Gordon SpenceNF
no factor from 2^64 to 2^65
2016-09-16mikrNF-PM1
B1=60000000, B2=3000000000, E=12
2015-12-15Gordon SpenceNF
no factor from 2^63 to 2^64
2015-12-15Gordon SpenceNF
no factor from 2^62 to 2^63
2015-07-25NRNF
no factor from 2^61 to 2^62
2013-05-17Sid & AndyNF
no factor from 2^60 to 2^61
2012-02-02alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2011-08-09JossNF-PM1
B1=1351297
2009-01-27Sturle SundeNF
no factor from 2^59 to 2^60
2008-12-30Sturle SundeNF
no factor from 2^58 to 2^59