Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
8000261Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
26753008948442231651.2old
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2018-07-04_p95holder_3C728F870A34B99C125665553
Verified2019-06-17timbit3C728F870A34B99C1758003153
History
DateUserTypeResult
2024-02-24Stef42NF-PM1
B1=921000, B2=1681748250
2022-12-13LordJuliusNF
no factor from 2^67 to 2^68
2022-12-13LordJuliusNF
no factor from 2^66 to 2^67
2022-12-13LordJuliusNF
no factor from 2^65 to 2^66
2022-12-13LordJuliusNF
no factor from 2^64 to 2^65
2019-06-17timbitC-PRP
M8000261/2675300894844223 : 3C728F870A34B99C
PRP: Verified
PRP without proof (not generated)
2018-07-04_p95holder_C-PRP
M8000261/2675300894844223 : 3C728F870A34B99C
PRP: Verified
PRP without proof (not generated)