5^563-1

Open composite · C378

NFS Planning

GNFS Murphy estimate: 2.66e-25
SNFS Murphy score: 3.12e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.57053

Identifiers

Target expression: 5^563-1
Target link: FactorDB page
Target ID: 1000000000018437391
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C378
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(1) 65309.180161.439141. C378

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 3.12e-18
Skew: 1.57053
Selected: Best

n: 160256128074527216573048803902403726406683449509421658341017324782595737522287089361062300414406256906869587572936467270169998235780725369728293647661917170863103080322041264415723005918888793031872918335870246988093257482080243554963868578122124589988467446275723751437755086414898187420399401222725696011090288580787489530204646806672000035219500246795802392062054241342612959
# 5^563-1, difficulty: 393.52, skewness: 1.99
# cost: 1.10469e+23, est. time: 52604371.64 GHz days (not accurate yet!)
# Optimized skew: 1.57053 Murphy: 3.12e-18
skew: 1.57053
c7: 1
c0: -125
Y1: -82718061255302767487140869206996285356581211090087890625
Y0: 1
type: snfs