2+(4k)

2^1316+1

Open composite · C307

NFS Planning

GNFS Murphy estimate: 3.49e-21
SNFS Murphy score: 1.02e-16
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 6
SNFS skew: 1.41146

Identifiers

Target expression: 2^1316+1
Target link: FactorDB page
Target ID: 1000000000012151340
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C307
Imported: Jun 03, 2026, 04:30 PM UTC

Raw pmain126 Factorization

(4,28,188) 224246401.151222684250456561. C307

SNFS Polynomial

Polynomial

Degree: 6
Murphy: 1.02e-16
Skew: 1.41146
Selected: Best

n: 6809288356057921605643063818209178158351086227008595550379360112515926631674341201596662755119588736182031235034570434196739343171747018668340716446460555505754956002679107408238742582051960668618289277035320821575335683380130299296506834326876378583810911628265127726242256128472665694542176634541995603361
# 2^1316+1, difficulty: 339.56, skewness: 1.00
# cost: 4.16814e+21, est. time: 1984829.78 GHz days (not accurate yet!)
# Optimized skew: 1.41146 Murphy: 1.02e-16
skew: 1.41146
c6: 1
c5: -1
c4: 1
c3: -1
c2: 1
c1: -1
c0: 1
Y1: -1
Y0: 392318858461667547739736838950479151006397215279002157056
type: snfs