2+(odd)

2^1457+1

Open composite · C416

NFS Planning

GNFS Murphy estimate: 1.66e-27
SNFS Murphy score: 1.06e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.86162

Identifiers

Target expression: 2^1457+1
Target link: FactorDB page
Target ID: 1000000000012151481
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C416
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,31,47) C416

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 1.06e-19
Skew: 0.86162
Selected: Best

n: 39580864462671557753947405189960292784211606299605666313361598097101177273150515243851783875994725027832751356573157181526365408851667801258304624564740790755739899267655168077195902729971946157734173931024198702171228881299734437550785885334171977256843651597556738881342199176736104125928335804397659477686251464262885043536594688181211728382948001427527776648024573949919129723657256904914807215887430429322510339
# 2^1457+1, difficulty: 438.60, skewness: 1.10
# cost: 1.39502e+24, est. time: 664297126.10 GHz days (not accurate yet!)
# Optimized skew: 0.86162 Murphy: 1.06e-19
skew: 0.86162
c7: 1
c0: 2
Y1: -411376139330301510538742295639337626245683966408394965837152256
Y0: 1
type: snfs