7^487-1

Open composite · C397

NFS Planning

GNFS Murphy estimate: 2.10e-26
SNFS Murphy score: 8.11e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.31532

Identifiers

Target expression: 7^487-1
Target link: FactorDB page
Target ID: 1000000000018628935
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C397
Imported: Jun 03, 2026, 04:31 PM UTC

Raw pmain126 Factorization

(1) 349667.1229048719. C397

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 8.11e-19
Skew: 1.31532
Selected: Best

n: 1417002089288505354704286396585192123586738774467933514880177401904273292695348214300073171162348806960698537029059768979128024098020441478768746159654181324403699039699211360173941354398438910354743362883688234780188004684316530701939655344761813172471020445037579846245781770392460504113058241795700726414378200678915649123345693970192004385709352764797687857664696554350436462251982273901157709
# 7^487-1, difficulty: 412.41, skewness: 1.28
# cost: 3.26192e+23, est. time: 155329501.16 GHz days (not accurate yet!)
# Optimized skew: 1.31532 Murphy: 8.11e-19
skew: 1.31532
c8: 1
c0: -7
Y1: -1
Y0: 3556153025177363557255317383565515512407041673852007
type: snfs