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
1937657Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
22941858891031.1old
104626502434811443.32014-01-10 14:36:12
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)2025-09-02Kriesel39F8E5407046FCC3013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30alpertron9F5B8189E66E05D92013
Verified2017-10-20Oliver Kruse9F5B8189E66E05D9291270813
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
39F8E5407046FCC3
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2025-06-25alex4NF-PM1
B1=7750642, B2=91023182250
2017-10-20Oliver KruseC-PRP
M1937657/2294185889/10462650243481 : 9F5B8189E66E05D9
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M1937657/10462650243481/2294185889 : 9F5B8189E66E05D9
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2014-01-10TJAOIF
Factor: 10462650243481