Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
12707281Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
15900145063075947464712270.4old
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2022-05-03PoaoCDF186B6BF199C0812519053
History
DateUserTypeResult
2022-06-23LordJuliusNF
no factor from 2^66 to 2^67
2022-06-23LordJuliusNF
no factor from 2^65 to 2^66
2022-06-23LordJuliusNF
no factor from 2^64 to 2^65
2022-05-03PoaoCERT
PRP Certification
Proof certified good
2022-05-03PoaoC-PRP
M12707281/1590014506307594746471 : CDF186B6BF199C08
PRP proof power = 8
PRP: Verified
Proof certified good
2022-05-02nordiNF-PM1
B1=400000, B2=428459850
2022-05-01nordiNF-PM1
B1=400000
2022-04-11Lisander ViaeneNF
no factor from 2^67 to 2^68