2+(4k)

2^1456+1

Open composite · C320

NFS Planning

GNFS Murphy estimate: 6.15e-22
SNFS Murphy score: 3.73e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 6
SNFS skew: 1.42868

Identifiers

Target expression: 2^1456+1
Target link: FactorDB page
Target ID: 1000000000012151480
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C320
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(16,112,208) 19050263233.33203532563859841. C320

SNFS Polynomial

Polynomial

Degree: 6
Murphy: 3.73e-18
Skew: 1.42868
Selected: Best

n: 96711108086962071818425908834409244125902988027686365764717291092291283154250879233503257771914415565156795858435538084226423595247727007405848479260496630300118700204707690731420130495044440097575362985116395154333879216669986941380408135542081040529762237389023126240750942285614321672093241724642437015640925895603137
# 2^1456+1, difficulty: 375.69, skewness: 1.00
# cost: 3.85996e+22, est. time: 18380741.75 GHz days (not accurate yet!)
# Optimized skew: 1.42868 Murphy: 3.73e-18
skew: 1.42868
c6: 1
c5: -1
c4: 1
c3: -1
c2: 1
c1: -1
c0: 1
Y1: -1
Y0: 411376139330301510538742295639337626245683966408394965837152256
type: snfs