2+(odd)

2^1495+1

Open composite · C258

NFS Planning

GNFS Murphy estimate: 2.42e-18
SNFS Murphy score: 2.21e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.76608

Identifiers

Target expression: 2^1495+1
Target link: FactorDB page
Target ID: 1000000000012151519
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C258
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(1,5,13,23,65,115,299) 14751372316704213236801.141998787657583801252851679089742008091.C258

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 2.21e-17
Skew: 0.76608
Selected: Best

n: 253445232156427715190651847060050103182060059814296675182607558389722197694091117094621138285163006199276835357833839385705834521142345259412833596550635071369556364491371158050993983458902623776534303228914422973542981685049728405278403222696393455429611921
# 2^1495+1, difficulty: 360.03, skewness: 0.71
# cost: 1.49587e+22, est. time: 7123197.25 GHz days (not accurate yet!)
# Optimized skew: 0.76608 Murphy: 2.21e-17
skew: 0.76608
c8: 16
c6: -8
c4: 4
c2: -2
c0: 1
Y1: -1
Y0: 713623846352979940529142984724747568191373312
type: snfs