10-

10^409-1

Open composite · C320

NFS Planning

GNFS Murphy estimate: 6.15e-22
SNFS Murphy raw: 7.24e-19
SNFS Murphy normalized (deg 6): 4.53e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.05441

Identifiers

Target expression: 10^409-1
Target link: FactorDB page
Target ID: 1100000000013095660
Target changed: Before 6/8/2026
Parent query: Same as target
Parent ID: -
Cofactor token: C320
Imported: Jun 07, 2026, 01:42 AM UTC

Raw pmain126 Factorization

(1) 1637.13907.77711.1375877.2777111.5371851809.7061270715258437.230703986686330645437422372795294965009.C320

SNFS Polynomial

Polynomial

Degree: 7
Raw Murphy: 7.24e-19
Normalized (deg 6): 4.53e-19
Skew: 1.05441
Selected: Best

n: 18782700121789322140516475898102146084311906005692312412404186351756530288579012684499339332898847580856961179997594580883361687463732132096197434156900894479486303950957492349113295283059519530039038154153566651410339115625673454476604813752668290528489032979531669196586809334057474920812531855524006798554161956866521
# 10^409-1, difficulty: 410.20, skewness: 1.34
# cost: 2.8793e+23, est. time: 137109423.14 GHz days (not accurate yet!)
# Optimized skew: 1.05441 Murphy: 7.24e-19
skew: 1.05441
c7: 16
c0: -125
Y1: -20000000000000000000000000000000000000000000000000000000000
Y0: 1
type: snfs