2^1345-1

Open composite · C278

NFS Planning

GNFS Murphy estimate: 1.68e-19
SNFS Murphy score: 1.63e-16
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.79456

Identifiers

Target expression: 2^1345-1
Target link: FactorDB page
Target ID: 1000000000000001345
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C278
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(5,269) 2427739777657193401.119136832329401379240227791. C278

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 1.63e-16
Skew: 0.79456
Selected: Best

n: 90295364982128901694178700979125466499663819065882562660837364172801787195578756777195780005120714594877419034129597433771212930707733241895524062566217360848083414787790081415513184572807158489388804834963067588131619593397756900689797043306293552074838779133172495279947083001
# 2^1345-1, difficulty: 323.91, skewness: 0.71
# cost: 1.52e+21, est. time: 723808.54 GHz days (not accurate yet!)
# Optimized skew: 0.79456 Murphy: 1.63e-16
skew: 0.79456
c8: 16
c6: 8
c4: 4
c2: 2
c0: 1
Y1: -1
Y0: 21778071482940061661655974875633165533184
type: snfs