2^1403-1

Open composite · C285

NFS Planning

GNFS Murphy estimate: 6.59e-20
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: 1000000000000001403
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C285
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(23,61) 7365751.50363887381959227167658519.184974108671317434008988391371809.707964508185716596099485802562115938162908630127.C285

SNFS Polynomial

Polynomial

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

n: 235562212990827227367970774674559492210057162607008726513469360590745464872034725682567772532947286523569185609636834592007313943412355900083010281747552960077494995174774971537213360701836248423379350814499358189757245906131040368466798222238242986617261235049356880618992730796833953
# 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