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

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MnStatusDetails
1911929Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
8465830419111239.6old
21573442064411341.02008-07-15 07:48:08
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)2025-09-02KrieselD6181C3C88A7F8EC013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-04Oliver KruseF003AFB765422AF02013
Verified2017-11-09kkmrkkblmbrbkF003AFB765422AF02111975713
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
D6181C3C88A7F8EC
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-09kkmrkkblmbrbkC-PRP
M1911929/846583041911/2157344206441 : F003AFB765422AF0
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1911929/846583041911/2157344206441 : F003AFB765422AF0
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 2157344206441