2^1243-1

Open composite · C337

NFS Planning

GNFS Murphy estimate: 6.35e-23
SNFS Murphy raw: 7.13e-18
SNFS Murphy normalized (deg 6): 1.14e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 5
SNFS skew: 1.54107

Identifiers

Target expression: 2^1243-1
Target link: FactorDB page
Target ID: 1000000000000001243
Target changed: Before 6/8/2026
Parent query: Same as target
Parent ID: -
Cofactor token: C337
Imported: Jun 07, 2026, 01:40 AM UTC

Raw pmain126 Factorization

(11,113) C337

SNFS Polynomial

Polynomial

Degree: 5
Raw Murphy: 7.13e-18
Normalized (deg 6): 1.14e-17
Skew: 1.54107
Selected: Best

n: 7124875134919416452774071346240764917465050401053729788475829418006792633070197260773480462000925038600888030166963314178711084227927169505054967049906157236644045588489318562381444403587801123276191390920852492526599174604254696368010876509960456095578194840205874002033519141134093531142804832239163228700607998501023572045880402900991
# 2^1243-1, difficulty: 340.16, skewness: 1.00
# cost: 4.3306e+21, est. time: 2062188.46 GHz days (not accurate yet!)
# Optimized skew: 1.54107 Murphy: 7.13e-18
skew: 1.54107
c5: 1
c4: 1
c3: -4
c2: -3
c1: 3
c0: 1
Y1: -10384593717069655257060992658440192
Y0: 107839786668602559178668060348078522694548577690162289924414440996865
type: snfs