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

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MnStatusDetails
12768517Factored
FactorDigitsBitsDate
9771432450915312817101612479.72016-04-24 21:52:33
ECM
DigitsB1Curves
25500001 / 280
Estimated T-Level: 20.0
TF below 2^61 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2001-07-03C. Cooper / S. Boone6E1928778CBA761A348701
Verified (Factored)2004-10-03Marc Getty / Phil Fizur6E1928778CBA761A11554569
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2022-05-11PoaoFE9004DD3E29A1031552715853
History
DateUserTypeResult
2023-10-26nordiNF-PM1
B1=500000, B2=430944150
2023-10-15nordiNF-PM1
B1=500000
2022-05-11GufesaCERT
PRP Certification
Proof certified good
2022-05-11PoaoC-PRP
M12768517/977143245091531281710161 : FE9004DD3E29A103
PRP proof power = 8
PRP: Verified
Proof certified good
2016-04-24bamF-ECM
Factor: 977143245091531281710161 / (ECM curve 1, B1=50000, B2=5000000)
2015-05-06ThaNF-PM1
B1=300000, B2=6000000, E=12
2015-04-05ThaNF
no factor from 2^66 to 2^67
2014-04-21NesowaNF
no factor from 2^65 to 2^66
2013-06-06lycornNF
no factor from 2^64 to 2^65