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
1778537Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
195639071927.5old
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02KrieselF4A3AF1711731B4A013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-03Oliver Kruse1FBD0E63D15E5D1D1013
Verified2017-11-11kkmrkkblmbrbk1FBD0E63D15E5D1D1130330613
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
F4A3AF1711731B4A
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-11kkmrkkblmbrbkC-PRP
M1778537/195639071 : 1FBD0E63D15E5D1D
PRP: Verified
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1778537/195639071 : 1FBD0E63D15E5D1D
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12