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
397759Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
15910361823.9old
226722631927.82008-07-21 09:18:30
ECM
DigitsB1Curves
2550000280 / 280
30250000297 / 640
Estimated T-Level: 27.3
TF below 2^86 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-23Oliver Kruse9F6F0B1F2EB0A60C2013
Verified2017-09-24Oliver Kruse9F6F0B1F2EB0A60C2013
Verified2017-11-07kkmrkkblmbrbk9F6F0B1F2EB0A60C225915213
Verified2020-04-18Oliver Kruse8267D7386C7CD15C217174053
Verified2024-10-10kkmrkkblmbrbk8267D7386C7CD15C29591253
History
DateUserTypeResult
2024-10-10McBrownCERT
PRP Certification
Proof certified good
2024-10-10kkmrkkblmbrbkC-PRP
M397759/15910361/226722631 : 8267D7386C7CD15C
PRP proof power = 5
PRP: Verified
Proof certified good
2024-10-08yuriy_5-1NF-PM1
B1=12000002, B2=2110712904300
2022-03-18Lisander ViaeneNF-PM1
B1=1000000, B2=21469798350
2020-04-18Oliver KruseC-PRP
M397759/15910361/226722631 : 8267D7386C7CD15C
PRP: Verified
PRP without proof (small exponent)
2017-11-07kkmrkkblmbrbkC-PRP
M397759/15910361/226722631 : 9F6F0B1F2EB0A60C
PRP: Verified
PRP without proof (small exponent)
2017-09-24Oliver KruseC-PRP
M397759/15910361/226722631 : 9F6F0B1F2EB0A60C
PRP: Verified
PRP without proof (not generated)
2017-09-23Oliver KruseC-PRP
M397759/15910361/226722631 : 9F6F0B1F2EB0A60C
PRP: Verified
PRP without proof (not generated)
2008-07-21J FeitsmaF
Factor: 226722631