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
42608551Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 276
TF target 272
P-1
B1 = 1500000
B2 = 45000000
ECM
DigitsB1Curves
255000016 / 280
Estimated T-Level: 20.3 ⓘ
LL
StatusDateUserResidueShift
Verified2009-07-15Bruce Anderson1867705B9783079315781526
Verified2017-11-20Smok_bmv 1867705B9783079312062424
History
DateUserTypeResult
2021-11-07One ManNF-PP1
Start=6/5, B1=600000, B2=13800000
2021-09-12One ManNF-PP1
Start=2/7, B1=600000, B2=22800000
2021-06-30-Anonymous-NF
no factor from 2^75 to 2^76
2021-06-30Yves de WandelaarNF
no factor from 2^74 to 2^75
2021-03-18Sid & AndyNF-PM1
B1=1500000, B2=45000000
2020-01-17-Anonymous-NF
no factor from 2^73 to 2^74
2019-10-11-Anonymous-NF
no factor from 2^72 to 2^73
2017-11-20Smok_bmv C-LL
1867705B97830793
2015-08-30-Anonymous-NF
no factor from 2^71 to 2^72
2015-04-04Mark RoseNF
no factor from 2^70 to 2^71
2015-02-19chalsallNF
no factor from 2^69 to 2^70
2014-03-08LaurVNF
no factor from 2^68 to 2^69
2009-07-15Bruce AndersonC-LL
1867705B97830793
2009-03-24DSheetsNF-PM1
B1=445000, B2=3671250