Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
198719Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
96974873826.5old
165731647927.32008-07-27 10:50:11
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000232 / 1566
Estimated T-Level: 30.7
TF below 2^97 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver Kruse6F6F0A449A494E202013
Verified2017-09-22Oliver Kruse6F6F0A449A494E202013
Verified2017-11-06kkmrkkblmbrbk6F6F0A449A494E2021252513
Verified2020-04-17Oliver Kruse480807A68B9DF0AB210920453
Verified2023-08-24USAFSS480807A68B9DF0AB218803153
History
DateUserTypeResult
2023-08-24curtiscCERT
PRP Certification
Proof certified good
2023-08-24USAFSSC-PRP
M198719/96974873/165731647 : 480807A68B9DF0AB
PRP proof power = 5
PRP: Verified
Proof certified good
2020-04-17Oliver KruseC-PRP
M198719/96974873/165731647 : 480807A68B9DF0AB
PRP: Verified
PRP without proof (small exponent)
2017-11-06kkmrkkblmbrbkC-PRP
M198719/96974873/165731647 : 6F6F0A449A494E20
PRP: Verified
PRP without proof (small exponent)
2017-09-30kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12
2017-09-22Oliver KruseC-PRP
M198719/96974873/165731647 : 6F6F0A449A494E20
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M198719/96974873/165731647 : 6F6F0A449A494E20
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M198719/96974873/165731647 : 6F6F0A449A494E20
PRP without proof (not generated)
2008-07-27J FeitsmaF
Factor: 165731647