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
1257017Factored
FactorDigitsBitsDate
30362787580192409591961.42011-05-09 14:41:57
ECM
DigitsB1Curves
2550000280 / 280
30250000104 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski2720
Verified (Factored)George WoltmanF9C60DE8EDB822720
Verified (Factored)Brian J. BeesleyF9C60DE8EDB822720
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-29Oliver Kruse05E26D2250C9AF321013
Verified2017-10-21kkmrkkblmbrbk05E26D2250C9AF32180956813
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^58 to 2^60
2017-10-21kkmrkkblmbrbkC-PRP
M1257017/3036278758019240959 : 05E26D2250C9AF32
PRP: Verified
PRP without proof (not generated)
2017-09-29Oliver KruseC-PRP
M1257017/3036278758019240959 : 05E26D2250C9AF32
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=300000, B2=10000000, E=12
2011-05-09XyzzyF-ECM
Factor: 3036278758019240959
2009-02-14Sturle SundeNF
no factor from 2^60 to 2^61