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

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Exponent Range:










MnStatusDetails
185233Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
4445593722.1old
398621417928.62008-07-27 10:49:51
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000646 / 1566
Estimated T-Level: 32.1
TF below 2^102 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver Kruse11B3593767192A802013
Verified2017-10-12kkmrkkblmbrbk11B3593767192A8026005813
Verified2020-04-17Oliver Kruse8E7BDB74653C571F22229053
Verified2023-08-24USAFSS8E7BDB74653C571F25448453
History
DateUserTypeResult
2023-08-24curtiscCERT
PRP Certification
Proof certified good
2023-08-24USAFSSC-PRP
M185233/4445593/398621417 : 8E7BDB74653C571F
PRP proof power = 5
PRP: Verified
Proof certified good
2020-04-17Oliver KruseC-PRP
M185233/4445593/398621417 : 8E7BDB74653C571F
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M185233/4445593/398621417 : 11B3593767192A80
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M185233/4445593/398621417 : 11B3593767192A80
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M185233/4445593/398621417 : 11B3593767192A80
PRP without proof (not generated)
2017-05-26kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12
2008-07-27J FeitsmaF
Factor: 398621417