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
2861569Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
17760967559171511650.7old
ECM
DigitsB1Curves
2550000125 / 280
Estimated T-Level: 22.2
TF below 2^69 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-22Oliver KruseD805A94EBF0A2D85191308053
Verified2017-12-07kkmrkkblmbrbkD805A94EBF0A2D851115413453
History
DateUserTypeResult
2022-11-21USAFSSNF-PM1
B1=255000, B2=195390690
2017-12-07kkmrkkblmbrbkC-PRP
M2861569/1776096755917151 : D805A94EBF0A2D85
PRP: Verified
PRP without proof (not generated)
2017-10-22Oliver KruseC-PRP
M2861569/1776096755917151 : D805A94EBF0A2D85
PRP: Verified
PRP without proof (not generated)