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

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MnStatusDetails
2561411Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
66596687826.0old
722317903929.42008-07-14 20:25:01
494291890913081931755.52015-01-26 11:10:15
ECM
DigitsB1Curves
2550000133 / 280
Estimated T-Level: 22.4
TF below 2^69 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-15Oliver KruseA34CF11E77DA9C5C390495853
Verified2017-12-01ATHA34CF11E77DA9C5C3192585353
History
DateUserTypeResult
2022-08-27USAFSSNF-PM1
B1=480000, B2=446264910
2017-12-01ATHC-PRP
M2561411/66596687/722317903/49429189091308193 : A34CF11E77DA9C5C
PRP: Verified
PRP without proof (not generated)
2017-10-15Oliver KruseC-PRP
M2561411/66596687/722317903/49429189091308193 : A34CF11E77DA9C5C
PRP: Verified
PRP without proof (not generated)
2015-01-26TJAOIF
Factor: 49429189091308193 / TF: 55-56
2008-07-14George WoltmanF-ECM
Factor: 722317903