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
1553597Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 268
TF target 261
TF below 2^81 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 21100000
B2 = 81169408320
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 640
Estimated T-Level: 25.8 ⓘ
LL
StatusDateUserResidueShift
VerifiedRich Harms13BA80B291BF6E650
Verified1998-10-29Greg Hewgill13BA80B291BF6E65140195
Verified2015-07-20MadPoo13BA80B291BF6E65654153
History
DateUserTypeResult
2023-10-19Sid & AndyNF-PM1
B1=21100000, B2=81169408320
2023-08-10JossNF-PM1
B1=10001000, B2=17741407320
2023-05-10JossNF-PM1
B1=10001000, B2=8289448440
2023-02-22JossNF-PM1
B1=10001000, B2=3563469000
2022-12-23JossNF-PM1
B1=10001000, B2=1200523170
2018-06-08ramgeisNF
no factor from 2^67 to 2^68
2018-02-05TJAOINF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-10-11ramgeisNF
no factor from 2^65 to 2^66
2015-07-20MadPooC-LL
13BA80B291BF6E65
2015-03-25VictordeHollanderNF-PM1
B1=10000000, B2=200000000, E=12
2015-02-17snme2pm1NF
no factor from 2^64 to 2^65
2015-02-17snme2pm1NF
no factor from 2^63 to 2^64
2013-11-17David CampeauNF-PM1
B1=945000, B2=27405000, E=12
2011-01-26James HeinrichNF-PM1
B1=80000, B2=1360000, E=6
2010-06-02GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-05-02Architects CubedNF
no factor from 2^60 to 2^61