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
262897Factored
FactorDigitsBitsDate
3078497121318112528072168.12008-02-18 21:44:12
ECM
DigitsB1Curves
2550000280 / 280
30250000411 / 640
Estimated T-Level: 28.2 ⓘ
TF below 2^89 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski6F740
Verified (Factored)Unknown6F740
Verified (Factored)Brian J. BeesleyA3252A59D8EFEF740
Verified (Factored)Eivind TrielA3252A59D8EFEF7445572
Verified (Factored)2001-10-20Brian J. BeesleyA3252A59D8EFEF74129794
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-22Oliver Kruse10AFF0B68B609E821013
Verified2017-10-12kkmrkkblmbrbk10AFF0B68B609E82111786413
Unverified (Reliable)2020-04-17Oliver KruseDED1C72EED32D9__118887453
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2020-04-17Oliver KruseC-PRP
M262897/307849712131811252807 : DED1C72EED32D9__
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M262897/307849712131811252807 : 10AFF0B68B609E82
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M262897/307849712131811252807 : 10AFF0B68B609E82
PRP: Unverified (Reliable)
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M262897/307849712131811252807 : 10AFF0B68B609E82
PRP without proof (not generated)
2008-02-18Chad DavisF-ECM
Factor: 307849712131811252807