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

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Exponent Range:










MnStatusDetails
291287Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
1965208525691237.5old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000193 / 1566
Estimated T-Level: 30.6
TF below 2^97 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-24Oliver KruseD6F72C9B6D0D96041013
Verified2017-10-12Oliver KruseD6F72C9B6D0D9604121646113
Verified2017-11-06kkmrkkblmbrbkD6F72C9B6D0D9604113849213
Verified2020-04-17Oliver Kruse067EEA5F47D0B70617709453
Verified2024-08-16kkmrkkblmbrbk067EEA5F47D0B706125688953
History
DateUserTypeResult
2024-11-21yuriy_5-1NF-PM1
B1=26798404, B2=6537512951970
2024-08-16Oliver KruseCERT
PRP Certification
Proof certified good
2024-08-16kkmrkkblmbrbkC-PRP
M291287/196520852569 : 067EEA5F47D0B706
PRP proof power = 5
PRP: Verified
Proof certified good
2023-12-10USAFSSNF-PM1
B1=1875000, B2=6976299330
2022-06-16some-studentsNF-PM1
B1=1000000, B2=51000000
2022-02-06Lisander ViaeneNF-PM1
B1=50000
2020-04-17Oliver KruseC-PRP
M291287/196520852569 : 067EEA5F47D0B706
PRP: Verified
PRP without proof (small exponent)
2017-11-06kkmrkkblmbrbkC-PRP
M291287/196520852569 : D6F72C9B6D0D9604
PRP: Verified
PRP without proof (small exponent)
2017-10-12Oliver KruseC-PRP
M291287/196520852569 : D6F72C9B6D0D9604
PRP: Verified
PRP without proof (small exponent)
2017-09-24Oliver KruseC-PRP
M291287/196520852569 : D6F72C9B6D0D9604
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M291287/196520852569 : D6F72C9B6D0D9604
PRP without proof (not generated)