12-

12^391-1

Open composite · C274

NFS Planning

GNFS Murphy estimate: 2.86e-19
SNFS Murphy score: 2.10e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.21604

Identifiers

Target expression: 12^391-1
Target link: FactorDB page
Target ID: 1100000000013092233
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C274
Imported: Jun 03, 2026, 04:32 PM UTC

Raw pmain126 Factorization

(1,17,23) 3911.42666437154587.775564345452766641218491238140273.85861839677237281730993302323005621241090414838525636691.C274

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 2.10e-18
Skew: 1.21604
Selected: Best

n: 6140699260215709479905946900796920798711803070458082738000843822875931648958569838307474079217361203026849416671594253113499270111952652962128111045034828434744665972559757974110152419028447921636166995720569786414936324588004965560778438411638400027764404452852653067885651
# 12^391-1, difficulty: 397.14, skewness: 1.00
# cost: 1.36259e+23, est. time: 64885364.15 GHz days (not accurate yet!)
# Optimized skew: 1.21604 Murphy: 2.10e-18
skew: 1.21604
c8: 1
c7: 1
c6: -7
c5: -6
c4: 15
c3: 10
c2: -10
c1: -4
c0: 1
Y1: -6624737266949237011120128
Y0: 43887143856106046360568987631860370008329246736385
type: snfs