2+(odd)

2^1223+1

Open composite · C230

NFS Planning

GNFS Murphy estimate: 1.02e-16
SNFS Murphy score: 2.37e-17
Preferred method: GNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.54060

Identifiers

Target expression: 2^1223+1
Target link: FactorDB page
Target ID: 1000000000012151247
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C230
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 594379.7309035684842414944321.68985116517993086161521463731317536484675563.14284698176007813051039186143044751965811053936987756845816446201699.C230

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 2.37e-17
Skew: 1.54060
Selected: Best

n: 11246397577484356387969532483305502229756907187886592959533975877400165675384056989940224159380306617479455197380129286183104659734173360750155562850110472076066292060483938312392721012233906473774652068330385267543772808384711041
# 2^1223+1, difficulty: 368.76, skewness: 1.22
# cost: 2.54559e+22, est. time: 12121846.11 GHz days (not accurate yet!)
# Optimized skew: 1.54060 Murphy: 2.37e-17
skew: 1.54060
c7: 1
c0: 4
Y1: -1
Y0: 47890485652059026823698344598447161988085597568237568
type: snfs