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
1946669Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
318903315591134.9old
152894303263511443.82008-09-30 13:30:30
164664993105531443.92008-09-30 13:30:30
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)2025-09-02Kriesel4613CB60FB4D4031013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver Kruse93F1037A1448D77E3013
Verified2017-11-15kkmrkkblmbrbk93F1037A1448D77E3138092513
History
DateUserTypeResult
2025-09-03JurzalCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
4613CB60FB4D4031
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-15kkmrkkblmbrbkC-PRP
M1946669/31890331559/15289430326351/16466499310553 : 93F1037A1448D77E
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1946669/31890331559/15289430326351/16466499310553 : 93F1037A1448D77E
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1946669/31890331559/15289430326351/16466499310553 : 93F1037A1448D77E
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-09-30markrF
Factor: 16466499310553
2008-09-30markrF
Factor: 15289430326351