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
1888129Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
90630193826.4old
587245881591135.82008-07-15 07:47:52
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 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)2025-09-02Kriesel02801D1DD781C78A013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-04Oliver Kruse30A15B8A02ECB2C22013
Verified2017-11-08kkmrkkblmbrbk30A15B8A02ECB2C22186777213
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
02801D1DD781C78A
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-08kkmrkkblmbrbkC-PRP
M1888129/90630193/58724588159 : 30A15B8A02ECB2C2
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1888129/90630193/58724588159 : 30A15B8A02ECB2C2
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 58724588159