12-

12^371-1

Open composite · C253

NFS Planning

GNFS Murphy estimate: 4.73e-18
SNFS Murphy score: 7.33e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 6
SNFS skew: 1.41325

Identifiers

Target expression: 12^371-1
Target link: FactorDB page
Target ID: 1100000000013092178
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C253
Imported: Jun 03, 2026, 04:32 PM UTC

Raw pmain126 Factorization

(1,7,53) 31588093811.31171278136982495216102935819686587.3394983341523445322455781980446475360931.C253

SNFS Polynomial

Polynomial

Degree: 6
Murphy: 7.33e-17
Skew: 1.41325
Selected: Best

n: 1388815455826867896383792412636286576779122678976144681343522401539744409015975843509863209037858117178314091127824598638200756937318532577598623888774455537966097704137204002263296901324405726677652835224776911494743753772272863335920386753618910782343
# 12^371-1, difficulty: 343.18, skewness: 1.00
# cost: 5.24153e+21, est. time: 2495968.14 GHz days (not accurate yet!)
# Optimized skew: 1.41325 Murphy: 7.33e-17
skew: 1.41325
c6: 1
c5: 1
c4: 1
c3: 1
c2: 1
c1: 1
c0: 1
Y1: -1
Y0: 1572555712320371480831006735579195460947411969842738102272
type: snfs