2+(odd)

2^1273+1

Open composite · C329

NFS Planning

GNFS Murphy estimate: 1.85e-22
SNFS Murphy score: 7.84e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.39982

Identifiers

Target expression: 2^1273+1
Target link: FactorDB page
Target ID: 1000000000012151297
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C329
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,19,67) 1326467.165613358312950064754563. C329

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 7.84e-18
Skew: 1.39982
Selected: Best

n: 28703408088862281402351299250343008131718628417340780496689851352208372338084771057915361249816336375337920008311001368891734671046489175946207971961050237096658684925759835631724317433316885847923194660188326290760827633348627135757297811291032743308468525043266418974622398438952715660268791500778709419196453895603800379467179
# 2^1273+1, difficulty: 383.51, skewness: 1.10
# cost: 6.14554e+22, est. time: 29264470.31 GHz days (not accurate yet!)
# Optimized skew: 1.39982 Murphy: 7.84e-18
skew: 1.39982
c7: 1
c0: 2
Y1: -1
Y0: 6129982163463555433433388108601236734474956488734408704
type: snfs