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
255803Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
78480360411032.9old
5390241027808550935412402712788.82020-02-20 12:48:44
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000198 / 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
Verified (Factored)2017-09-22Oliver Kruse21B0DE652ECB7C791013
Verified (Factored)2017-10-12Oliver Kruse21B0DE652ECB7C79125167413
Verified (Factored)2017-11-06kkmrkkblmbrbk21B0DE652ECB7C79113360113
Verified2020-02-21Jinyuan Wang217EBA305CCD3A6827421453
Verified2020-02-22James Heinrich217EBA305CCD3A6821721953
History
DateUserTypeResult
2022-04-26Oliver KruseNF-PM1
B1=30000000, B2=10035812696910
2021-09-04Oliver KruseNF-PM1
B1=30000000, B2=3000000000, E=24
2020-02-22James HeinrichC-PRP
M255803/7848036041/539024102780855093541240271 : 217EBA305CCD3A68
PRP: Verified
PRP without proof (small exponent)
2020-02-21Jinyuan WangC-PRP
M255803/7848036041/539024102780855093541240271 : 217EBA305CCD3A68
PRP: Verified
PRP without proof (small exponent)
2020-02-20Niels_Mache_NextcloudF-ECM
Factor: 539024102780855093541240271 / (ECM curve 2, B1=250000, B2=25000000, Sigma=6930270446742652)
2017-11-06kkmrkkblmbrbkC-PRP
M255803/7848036041 : 21B0DE652ECB7C79
PRP: Verified
PRP without proof (small exponent)
2017-10-12Oliver KruseC-PRP
M255803/7848036041 : 21B0DE652ECB7C79
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M255803/7848036041 : 21B0DE652ECB7C79
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M255803/7848036041 : 21B0DE652ECB7C79
PRP without proof (not generated)