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
1604441Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
323455305611134.9old
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)2025-09-02Kriesel1066EBBF5B8B9C35013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-02Oliver KruseC022E6A2513F6F961013
Verified2017-11-01kkmrkkblmbrbkC022E6A2513F6F961149071413
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
1066EBBF5B8B9C35
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-01kkmrkkblmbrbkC-PRP
M1604441/32345530561 : C022E6A2513F6F96
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1604441/32345530561 : C022E6A2513F6F96
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12