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
1686973Factored
FactorDigitsBitsDate
8664490460263287180892169.62008-06-13 19:52:25
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 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)Mark Skidmore98CFC05D623C9ECA0
Verified (Factored)1999-02-07Barre98CFC05D623C9ECA357273
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-03Oliver KruseD6A99ED4174FCAD11013
Verified2017-11-03ATHD6A99ED4174FCAD11151388013
History
DateUserTypeResult
2017-11-03ATHC-PRP
M1686973/866449046026328718089 : D6A99ED4174FCAD1
PRP: Verified
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1686973/866449046026328718089 : D6A99ED4174FCAD1
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-06-13Team_BunduF-ECM
Factor: 866449046026328718089