2+(4k)

2^1408+1

Open composite · C330

NFS Planning

GNFS Murphy estimate: 1.62e-22
SNFS Murphy score: 3.42e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.86398

Identifiers

Target expression: 2^1408+1
Target link: FactorDB page
Target ID: 1000000000012151432
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C330
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(128) 444929.1233948474881.72386545356458958441346486331202082817. C330

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 3.42e-19
Skew: 0.86398
Selected: Best

n: 523779938566833081001491976630936676306414031352878072663766636795173379399795349537010970814958145692535477528018387695981407366391588886986825495934081928717273437580119046270227878664295537722095771643484175891161955506819493372653441642352403558312456407422612590600445399100721078821335317415503091329897935173089646300471297
# 2^1408+1, difficulty: 423.85, skewness: 1.10
# cost: 6.19526e+23, est. time: 295012525.96 GHz days (not accurate yet!)
# Optimized skew: 0.86398 Murphy: 3.42e-19
skew: 0.86398
c7: 1
c0: 2
Y1: -3213876088517980551083924184682325205044405987565585670602752
Y0: 1
type: snfs