2+(odd)

2^1403+1

Open composite · C328

NFS Planning

GNFS Murphy estimate: 2.11e-22
SNFS Murphy score: 3.76e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.05375

Identifiers

Target expression: 2^1403+1
Target link: FactorDB page
Target ID: 1000000000012151427
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C328
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,23,61) 8419.660533517639289904327791350546169.4293891872287900315459210182165137.C328

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 3.76e-19
Skew: 1.05375
Selected: Best

n: 1437735546146129975786857643539260685515207524368169957703729091695120734304144870255360611211064310072479770188489356309979580235461463991281495900911328888197989722481923239856691675709380402128923524007252495870444745257602553479959230357698976366187843774560631805673959033983712552360036469834262625288761956448589222589593
# 2^1403+1, difficulty: 422.35, skewness: 1.35
# cost: 5.69738e+23, est. time: 271303692.44 GHz days (not accurate yet!)
# Optimized skew: 1.05375 Murphy: 3.76e-19
skew: 1.05375
c7: 1
c0: 8
Y1: -1606938044258990275541962092341162602522202993782792835301376
Y0: 1
type: snfs