2^1423-1

Open composite · C412

NFS Planning

GNFS Murphy estimate: 2.84e-27
SNFS Murphy score: 2.37e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.95322

Identifiers

Target expression: 2^1423-1
Target link: FactorDB page
Target ID: 1000000000000001423
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C412
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

1699063.104904621559. C412

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 2.37e-19
Skew: 0.95322
Selected: Best

n: 1302206101657092315943400121931212954830200288579935237760267986744854472629805537665186323301537209907784280280955189415187952283787341520379263224206653517008482422229324843101469918308374075321873939728053269843768813578624783991775817244700464933459105978798663398350366231408924053023985280793031923174827095614318483975610998614699455245290082568462755068476940136272407222640973355917924037780224130798671
# 2^1423-1, difficulty: 428.37, skewness: 1.22
# cost: 7.957e+23, est. time: 378904580.08 GHz days (not accurate yet!)
# Optimized skew: 0.95322 Murphy: 2.37e-19
skew: 0.95322
c7: 1
c0: -4
Y1: -12855504354071922204335696738729300820177623950262342682411008
Y0: 1
type: snfs