2+(odd)

2^1423+1

Open composite · C392

NFS Planning

GNFS Murphy estimate: 4.10e-26
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: 1000000000012151447
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C392
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 112804057.16986794977.577678113814125809. C392

SNFS Polynomial

Polynomial

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

n: 69894096738189383400130256903704602409403953226339328289315461821504678702950475810036674387425392152483893950240315770439400589627911805813265110437248951373642377834116986616701363661219508580316811209160846514974918836578775072996070778085562657923013821736673478974453809961773656410135753726922925615071326496791503482895670297052586853107927029916864875317837361118823443367777997166003
# 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