Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
1955047Factored
FactorDigitsBitsDate
189476882070837663132064.0old
1802209050728054034472167.32021-02-25 05:43:06
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.
LL
StatusDateUserResidueShift
Verified (Factored)Steffen Zahn2E09FD24890CB4C90
Verified (Factored)Tom Cage2E09FD24890CB4C90
Verified (Factored)1999-03-15David M. Anderson2E09FD24890CB4C91453716
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-05Oliver Kruse111C9FB1498291761013
Verified (Factored)2017-11-11kkmrkkblmbrbk111C9FB149829176120964013
Verified2021-02-25mrh51B729CF69E971672106237553
History
DateUserTypeResult
2021-02-25overclocked_by_defaultCERT
PRP Certification
Proof certified good
2021-02-25mrhC-PRP
M1955047/18947688207083766313/180220905072805403447 : 51B729CF69E97167
PRP proof power = 7
PRP: Verified
Proof certified good
2021-02-25_p95holder_F-ECM
Factor: 180220905072805403447 / (ECM curve 4, B1=50000, B2=5000000)
2017-11-11kkmrkkblmbrbkC-PRP
M1955047/18947688207083766313 : 111C9FB149829176
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1955047/18947688207083766313 : 111C9FB149829176
PRP: Verified (Factored)
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12