7^487-1

Open composite · C397

NFS Planning

GNFS Murphy estimate: 2.10e-26
SNFS Murphy raw: 6.11e-19
SNFS Murphy normalized (deg 6): 3.82e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 2.93319

Identifiers

Target expression: 7^487-1
Target link: FactorDB page
Target ID: 1000000000018628935
Target changed: Before 6/8/2026
Parent query: Same as target
Parent ID: -
Cofactor token: C397
Imported: Jun 07, 2026, 01:42 AM UTC

Raw pmain126 Factorization

(1) 349667.1229048719. C397

SNFS Polynomial

Polynomial

Degree: 7
Raw Murphy: 6.11e-19
Normalized (deg 6): 3.82e-19
Skew: 2.93319
Selected: Best

n: 1417002089288505354704286396585192123586738774467933514880177401904273292695348214300073171162348806960698537029059768979128024098020441478768746159654181324403699039699211360173941354398438910354743362883688234780188004684316530701939655344761813172471020445037579846245781770392460504113058241795700726414378200678915649123345693970192004385709352764797687857664696554350436462251982273901157709
# 7^487-1, difficulty: 414.10, skewness: 2.30
# cost: 3.58852e+23, est. time: 170881700.41 GHz days (not accurate yet!)
# Optimized skew: 2.93319 Murphy: 6.11e-19
skew: 2.93319
c7: 1
c0: -343
Y1: -1
Y0: 143503601609868434285603076356671071740077383739246066639249
type: snfs