2+(odd)

2^1385+1

Open composite · C262

NFS Planning

GNFS Murphy estimate: 1.42e-18
SNFS Murphy score: 1.14e-16
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.77807

Identifiers

Target expression: 2^1385+1
Target link: FactorDB page
Target ID: 1000000000012151409
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C262
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,5,277) 3098422646515321.18954673356763044685182371.4150752976422134998698211601561.C262

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 1.14e-16
Skew: 0.77807
Selected: Best

n: 1296757174810945115342563533432217981979390019023219464563892680086524654762300862515442537862979777724680549491447834251330683057413726379627382472144932430815289113197643615380085393311009316961162103216771241733044944939923457929595356891454440456833913770161
# 2^1385+1, difficulty: 333.54, skewness: 0.71
# cost: 2.83733e+21, est. time: 1351107.67 GHz days (not accurate yet!)
# Optimized skew: 0.77807 Murphy: 1.14e-16
skew: 0.77807
c8: 16
c6: -8
c4: 4
c2: -2
c0: 1
Y1: -1
Y0: 348449143727040986586495598010130648530944
type: snfs