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
15561281Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 274
TF target 269
P-1
B1 = 3000000
B2 = 2941004430
ECM
DigitsB1Curves
25500001 / 280
Estimated T-Level: 20.0 ⓘ
LL
StatusDateUserResidueShift
Verified2002-09-14Nick RupertD31B43D843EABC913035959
Verified2006-04-28Ars Technica Team Prime RibD31B43D843EABC9111173622
History
DateUserTypeResult
2022-08-18-Anonymous-NF-PM1
B1=3000000, B2=2941004430
2022-04-07Denial140NF-PM1
B1=3000000, B2=2941004430
2022-02-11gcardonaNF
no factor from 2^73 to 2^74
2022-01-31RichD0NF
no factor from 2^72 to 2^73
2021-09-19-Anonymous-NF
no factor from 2^71 to 2^72
2021-09-07SRBaseNF
no factor from 2^70 to 2^71
2021-06-06lycornNF
no factor from 2^69 to 2^70
2018-02-18ramgeisNF
no factor from 2^68 to 2^69
2018-02-18ramgeisNF
no factor from 2^67 to 2^68
2016-03-16Mark RoseNF
no factor from 2^65 to 2^66
2013-12-28NesowaNF
no factor from 2^66 to 2^67