2+(odd)

2^1375+1

Open composite · C257

NFS Planning

GNFS Murphy estimate: 2.77e-18
SNFS Murphy score: 1.32e-16
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.77898

Identifiers

Target expression: 2^1375+1
Target link: FactorDB page
Target ID: 1000000000012151399
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C257
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,5,11,25,55,125,275) 55001.31775887001.32592148446001.2714019277637251.C257

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 1.32e-16
Skew: 0.77898
Selected: Best

n: 69310892466630590555135849940792619964431239908873768532209775945314193109008791295539580320355193194923273381401873357149725316167909770327290458700233571646728801616023949454470481366960359785617989279073291432359085512655051146719430224535551270410810251
# 2^1375+1, difficulty: 331.13, skewness: 0.71
# cost: 2.4299e+21, est. time: 1157095.72 GHz days (not accurate yet!)
# Optimized skew: 0.77898 Murphy: 1.32e-16
skew: 0.77898
c8: 16
c6: -8
c4: 4
c2: -2
c0: 1
Y1: -1
Y0: 174224571863520493293247799005065324265472
type: snfs