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
1701487Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
12659063291030.2old
1251384853699829991856.82015-04-30 11:55:26
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)2025-09-02KrieselC4F8B19B87D54602013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-03Oliver Kruse1228084E4B18C52A2013
Verified2017-11-03kkmrkkblmbrbk1228084E4B18C52A293913013
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
C4F8B19B87D54602
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2021-07-15Dylan DelgadoNF-PM1
B1=3000000, B2=273000000
2017-11-03kkmrkkblmbrbkC-PRP
M1701487/1265906329/125138485369982999 : 1228084E4B18C52A
PRP: Verified
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1701487/1265906329/125138485369982999 : 1228084E4B18C52A
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2015-04-30TJAOIF
Factor: 125138485369982999 / TF: 56-57