Marin Mersenne 2^P-1
Username
Password
Forgot password?
Blue
Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
1553737Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
17246480711030.7old
558451579402871445.72008-08-26 20:19:31
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)2025-09-02Kriesel4862F58F5FADCAF9013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-01Oliver KruseF1FA0C64C19A5CF52013
Verified2017-10-30kkmrkkblmbrbkF1FA0C64C19A5CF52105218213
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
4862F58F5FADCAF9
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-10-30kkmrkkblmbrbkC-PRP
M1553737/1724648071/55845157940287 : F1FA0C64C19A5CF5
PRP: Verified
PRP without proof (not generated)
2017-10-01Oliver KruseC-PRP
M1553737/1724648071/55845157940287 : F1FA0C64C19A5CF5
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-08-26-Anonymous-F
Factor: 55845157940287