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
2151701Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
12910207823.6old
18646951116969978711960.72016-02-26 12:33:12
ECM
DigitsB1Curves
2550000280 / 280
30250000165 / 640
Estimated T-Level: 26.3
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30alpertronBC9CD492229BCF3D2013
Verified2017-10-21Oliver KruseBC9CD492229BCF3D2155409213
History
DateUserTypeResult
2017-10-21Oliver KruseC-PRP
M2151701/12910207/1864695111696997871 : BC9CD492229BCF3D
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M2151701/12910207/1864695111696997871 : BC9CD492229BCF3D
PRP: Verified
PRP without proof (not generated)
2016-03-22alpertronNF-PM1
B1=500000, B2=15000000, E=12
2016-02-26TJAOIF
Factor: 1864695111696997871 / TF: 60-61