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

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MnStatusDetails
1628989Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
14335103211030.4old
990672369921653018632066.42015-05-05 11:20:24
ECM
DigitsB1Curves
2550000280 / 280
30250000137 / 640
Estimated T-Level: 26.1
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel2DB3CB66FEA06EC6013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-02Oliver Kruse422B5C35D1C894352013
Verified2017-11-01kkmrkkblmbrbk422B5C35D1C894352108269713
P-1 factors
DateFactorB1B2
2015-05-059906723699216530186350000015000000
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
2DB3CB66FEA06EC6
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-01kkmrkkblmbrbkC-PRP
M1628989/1433510321/99067236992165301863 : 422B5C35D1C89435
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1628989/1433510321/99067236992165301863 : 422B5C35D1C89435
PRP: Verified
PRP without proof (not generated)
2015-05-05alpertronF-PM1
Factor: 99067236992165301863 / (P-1, B1=500000, B2=15000000, E=12)