Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
1800397
Composite, with 2 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 261
Factored
FactorDigitsBitsDate
169237319927.3old
734960367848171446.12014-02-04 11:31:52
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
StatusProofDateUserResidueShiftTypeBase
Factored
Certified Good
Power=6
2025-09-02Kriesel2DC4A90FC66F6A8F013
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
PRP without proof (not generated)
2017-11-21kkmrkkblmbrbk2DC4A90FC66F6A8F2117568053
Verified
PRP without proof (not generated)
2017-11-21storm55102DC4A90FC66F6A8F251145053
History
DateUserTypeResult
2025-09-03Dave ScottCERT
Proof certified good
2025-09-02KrieselC-PRP2DC4A90FC66F6A8F
Proof Certified Good

Proof Power: 6

2017-11-21storm5510C-PRP
M1800397/169237319/73496036784817 : 2DC4A90FC66F6A8F
2017-11-21kkmrkkblmbrbkC-PRP
M1800397/169237319/73496036784817 : 2DC4A90FC66F6A8F
2016-03-16alpertronNF-PM1B1=500000, B2=15000000, E=12
2014-02-04TJAOIFFactor: 73496036784817