2+(odd)

2^1381+1

Open composite · C325

NFS Planning

GNFS Murphy estimate: 3.15e-22
SNFS Murphy score: 6.40e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.95549

Identifiers

Target expression: 2^1381+1
Target link: FactorDB page
Target ID: 1000000000012151405
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C325
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1) 14147533469161.113738319658736238418567892099.2108932257668078812302329481992437152109096266553.C325

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 6.40e-19
Skew: 0.95549
Selected: Best

n: 5183851950314897535761141399492996850108290631196032394049840278085726668108450143204623149657616512419110628853206773545744222359182309642563632064032036243356309847453713126903222708031766106347718256639517275259921676101101008056158641882484998118582533741575280940243686455295117567013496922624428701138971375587291092953
# 2^1381+1, difficulty: 415.72, skewness: 1.22
# cost: 3.9323e+23, est. time: 187252502.85 GHz days (not accurate yet!)
# Optimized skew: 0.95549 Murphy: 6.40e-19
skew: 0.95549
c7: 1
c0: 4
Y1: -200867255532373784442745261542645325315275374222849104412672
Y0: 1
type: snfs