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
1621519Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
142693673927.1old
3913973430174311548.52014-04-04 10:45:28
33776727927363701691961.62016-05-09 11:12:39
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)2025-09-02Kriesel8373A2A6DA281869013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver Kruse2B319C1DC21B7A0E3013
Verified2017-11-10kkmrkkblmbrbk2B319C1DC21B7A0E3142133513
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
8373A2A6DA281869
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-10kkmrkkblmbrbkC-PRP
M1621519/142693673/391397343017431/3377672792736370169 : 2B319C1DC21B7A0E
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1621519/142693673/391397343017431/3377672792736370169 : 2B319C1DC21B7A0E
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1621519/142693673/391397343017431/3377672792736370169 : 2B319C1DC21B7A0E
PRP without proof (not generated)
2016-05-09TJAOIF
Factor: 3377672792736370169 / TF: 61-62
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12
2014-04-04TJAOIF
Factor: 391397343017431