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

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MnStatusDetails
1831153Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
374379963311211445.1old
1094878799428664961201772476.52021-04-30 08:12:05
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)2025-09-02Kriesel0F93EB1E606039E2013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-04Oliver Kruse355ECCCF0C77DB371013
Verified (Factored)2017-11-06kkmrkkblmbrbk355ECCCF0C77DB371282413
Verified2021-05-01LOBES0F93EB1E606039E22147823153
History
DateUserTypeResult
2025-09-03bbrabbitCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
0F93EB1E606039E2
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2021-05-01Ben DeloCERT
PRP Certification
Proof certified good
2021-05-01LOBESC-PRP
M1831153/37437996331121/109487879942866496120177 : 0F93EB1E606039E2
PRP proof power = 7
PRP: Verified
Proof certified good
2021-04-30TJAOIF-ECM
Factor: 109487879942866496120177 / (ECM curve 88, B1=50000, B2=6600000)
2017-11-06kkmrkkblmbrbkC-PRP
M1831153/37437996331121 : 355ECCCF0C77DB37
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1831153/37437996331121 : 355ECCCF0C77DB37
PRP: Verified (Factored)
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12