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
1981583Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 269
TF target 262
TF below 2^81 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 18000000
B2 = 52037845860
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 640
Estimated T-Level: 25.8 ⓘ
LL
StatusDateUserResidueShift
VerifiedThomas HonoldB0969E6BF04EB9F40
Verified1999-01-02Gordon M. SpenceB0969E6BF04EB9F41827521
Verified2015-07-12MadPooB0969E6BF04EB9F41841560
History
DateUserTypeResult
2022-10-15tim sNF
no factor from 2^68 to 2^69
2022-08-11masserNF-PP1
Start=2/7, B1=1400000, B2=49000000
2022-03-07RichD0NF-PM1
B1=18000000, B2=52037845860
2019-05-23chuenkitNF
no factor from 2^67 to 2^68
2018-11-26JossNF-PM1
B1=1981583, B2=247697875, E=12
2018-05-27JossNF-PM1
B1=1981583, B2=198158300, E=12
2018-03-06JossNF-PM1
B1=1981583, B2=120000000, E=12
2018-02-19TJAOINF
no factor from 2^66 to 2^67
2018-02-15JossNF-PM1
B1=1981583, B2=60000000, E=12
2018-01-24JossNF-PM1
B1=1981583, B2=30000000, E=12
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-09-11ramgeisNF
no factor from 2^65 to 2^66
2015-07-12MadPooC-LL
B0969E6BF04EB9F4
2015-03-15lycornNF
no factor from 2^64 to 2^65
2015-03-15lycornNF
no factor from 2^63 to 2^64
2011-07-01GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-01-28kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2009-12-19S485122NF
no factor from 2^60 to 2^61