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
266401Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
45836956071032.1old
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
Verified2017-09-22Oliver KruseCDC549343847BE4D1013
Verified2017-10-12Oliver KruseCDC549343847BE4D122343513
Verified2017-11-06kkmrkkblmbrbkCDC549343847BE4D17362913
Verified2020-04-17Oliver KruseA48CFC7012A61F7E114155953
Verified2024-08-01kkmrkkblmbrbkA48CFC7012A61F7E112642253
History
DateUserTypeResult
2024-10-21yuriy5-1NF-PM1
B1=24508892, B2=5977750478700
2024-08-01SchwaCERT
PRP Certification
Proof certified good
2024-08-01kkmrkkblmbrbkC-PRP
M266401/4583695607 : A48CFC7012A61F7E
PRP proof power = 5
PRP: Verified
Proof certified good
2022-03-20Lisander ViaeneNF-PM1
B1=5550000, B2=25042991610
2022-03-19Lisander ViaeneNF-PM1
B1=5550000
2022-01-03Lisander ViaeneNF-PM1
B1=100000
2020-04-17Oliver KruseC-PRP
M266401/4583695607 : A48CFC7012A61F7E
PRP: Verified
PRP without proof (small exponent)
2017-11-06kkmrkkblmbrbkC-PRP
M266401/4583695607 : CDC549343847BE4D
PRP: Verified
PRP without proof (small exponent)
2017-10-12Oliver KruseC-PRP
M266401/4583695607 : CDC549343847BE4D
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M266401/4583695607 : CDC549343847BE4D
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M266401/4583695607 : CDC549343847BE4D
PRP without proof (not generated)