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
1998977Factored
FactorDigitsBitsDate
15991817823.9old
855042421991136.32008-07-15 07:49:09
13259195115330458776332270.22021-04-03 01:31:23
ECM
DigitsB1Curves
2550000280 / 280
3025000059 / 640
Estimated T-Level: 25.5
TF below 2^80 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-05Oliver KruseBE9168C0A96797F42013
Verified (Factored)2017-11-13kkmrkkblmbrbkBE9168C0A96797F42175186413
Verified2021-04-03Kirill Frolov2E12DBDC25550065324208353
Verified2021-04-07LaurV2E12DBDC255500653107115153
History
DateUserTypeResult
2022-08-16USAFSSNF-PM1
B1=132000, B2=134381520
2021-04-07LaurVC-PRP
M1998977/15991817/85504242199/1325919511533045877633 : 2E12DBDC25550065
PRP: Verified
PRP without proof (not generated)
2021-04-03GuliverCERT
PRP Certification
Proof certified good
2021-04-03Kirill FrolovC-PRP
M1998977/15991817/85504242199/1325919511533045877633 : 2E12DBDC25550065
PRP proof power = 7
PRP: Verified
Proof certified good
2021-04-03MarkSF-ECM
Factor: 1325919511533045877633 / (ECM curve 6, B1=50000, B2=5000000, Sigma=4628118741371379)
2017-11-13kkmrkkblmbrbkC-PRP
M1998977/15991817/85504242199 : BE9168C0A96797F4
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1998977/15991817/85504242199 : BE9168C0A96797F4
PRP: Verified
PRP without proof (not generated)
2008-07-15J FeitsmaF
Factor: 85504242199