2+(odd)

2^1345+1

Open composite · C317

NFS Planning

GNFS Murphy estimate: 9.18e-22
SNFS Murphy score: 2.05e-16
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.78157

Identifiers

Target expression: 2^1345+1
Target link: FactorDB page
Target ID: 1000000000012151369
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C317
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,5,269) 2679241. C317

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 2.05e-16
Skew: 0.78157
Selected: Best

n: 27470772276356098048595288634344551250224380000176049635889262943216902177349392021313488253410952474244733769578984550645980766164302413079845906629601022319013123565615738410386136086541125456523493291215616964597467573102834261427780269927517236374425220584823516408024580163197867627914378727458968668945188526091
# 2^1345+1, difficulty: 323.91, skewness: 0.71
# cost: 1.52e+21, est. time: 723808.54 GHz days (not accurate yet!)
# Optimized skew: 0.78157 Murphy: 2.05e-16
skew: 0.78157
c8: 16
c6: -8
c4: 4
c2: -2
c0: 1
Y1: -1
Y0: 21778071482940061661655974875633165533184
type: snfs