2^1243-1

Open composite · C337

NFS Planning

GNFS Murphy estimate: 6.35e-23
SNFS Murphy score: 1.45e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.70302

Identifiers

Target expression: 2^1243-1
Target link: FactorDB page
Target ID: 1000000000000001243
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C337
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(11,113) C337

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 1.45e-17
Skew: 1.70302
Selected: Best

n: 7124875134919416452774071346240764917465050401053729788475829418006792633070197260773480462000925038600888030166963314178711084227927169505054967049906157236644045588489318562381444403587801123276191390920852492526599174604254696368010876509960456095578194840205874002033519141134093531142804832239163228700607998501023572045880402900991
# 2^1243-1, difficulty: 375.08, skewness: 1.35
# cost: 3.72341e+22, est. time: 17730533.62 GHz days (not accurate yet!)
# Optimized skew: 1.70302 Murphy: 1.45e-17
skew: 1.70302
c7: 1
c0: -8
Y1: -1
Y0: 383123885216472214589586756787577295904684780545900544
type: snfs