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
1861831Factored
FactorDigitsBitsDate
175200790590121158712063.92009-07-21 21:46:47
ECM
DigitsB1Curves
2550000280 / 280
3025000056 / 640
Estimated T-Level: 25.4
TF below 2^80 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)ampDFD471CF76F5B4F00
Verified (Factored)1999-03-01John K. HarrisDFD471CF76F5B4F0667686
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-04Oliver Kruse903F190E578609CB1013
Verified2017-11-07kkmrkkblmbrbk903F190E578609CB1177349213
History
DateUserTypeResult
2017-11-07kkmrkkblmbrbkC-PRP
M1861831/17520079059012115871 : 903F190E578609CB
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1861831/17520079059012115871 : 903F190E578609CB
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2009-07-21SubPrimeF-ECM
Factor: 17520079059012115871