2+(4k)

2^1328+1

Open composite · C329

NFS Planning

GNFS Murphy estimate: 1.85e-22
SNFS Murphy score: 2.12e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.55059

Identifiers

Target expression: 2^1328+1
Target link: FactorDB page
Target ID: 1000000000012151352
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C329
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(16) 15937.339430154689.1028919454842049.663490630862181023420758843785056257.C329

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 2.12e-18
Skew: 1.55059
Selected: Best

n: 24208869880474917677578051182157995500886332919924536702748862603320302383995861380635678935151093612752863167894649134019752767473814244995688844120212400006493033655718450817667432993365257420972865052206378350632141943357646066583531895107594190722864717653657651062550799378142151784146087517357300604509230845970189915386689
# 2^1328+1, difficulty: 400.37, skewness: 1.22
# cost: 1.64178e+23, est. time: 78179807.62 GHz days (not accurate yet!)
# Optimized skew: 1.55059 Murphy: 2.12e-18
skew: 1.55059
c7: 1
c0: 4
Y1: -1
Y0: 1569275433846670190958947355801916604025588861116008628224
type: snfs