12^391+1

Open composite · C254

NFS Planning

GNFS Murphy estimate: 4.14e-18
SNFS Murphy score: 2.10e-18
Preferred method: Similar
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.21603

Identifiers

Target expression: 12^391+1
Target link: FactorDB page
Target ID: 1100000000024338906
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C254
Imported: Jun 03, 2026, 04:32 PM UTC

Raw pmain126 Factorization

(1,17,23) 1043032737498035959.21008463509810749467905821.1019403035747209315949968129411794601.40713370960741296290014691262464855308794263797.C254

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 2.10e-18
Skew: 1.21603
Selected: Best

n: 88671794921643513925752330729236754726705848090239211405759885586786176426274669979070355895063693862095402519848569058958511565927228501835312274505424821713348793637093751687955960513963358563013188311356410788882003793892707338801106151569323744622307
# 12^391+1, difficulty: 397.14, skewness: 1.00
# cost: 1.36259e+23, est. time: 64885364.15 GHz days (not accurate yet!)
# Optimized skew: 1.21603 Murphy: 2.10e-18
skew: 1.21603
c8: 1
c7: -1
c6: -7
c5: 6
c4: 15
c3: -10
c2: -10
c1: 4
c0: 1
Y1: -6624737266949237011120128
Y0: 43887143856106046360568987631860370008329246736385
type: snfs