12-

12^389-1

Open composite · C413

NFS Planning

GNFS Murphy estimate: 2.48e-27
SNFS Murphy score: 4.09e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.85168

Identifiers

Target expression: 12^389-1
Target link: FactorDB page
Target ID: 1100000000013092230
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C413
Imported: Jun 03, 2026, 04:32 PM UTC

Raw pmain126 Factorization

(1) 3870551. C413

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 4.09e-19
Skew: 1.85168
Selected: Best

n: 14870967794537153526243221919147204757401132431338691877374630248058466924657264812343880132619075387270229917650985763828130416582223136925658289407415647435586361426154834499856184600958485520072923242477548986967537192087610068370339813219264338779877637781269187456581946132977950181120779953917080812439128421501389720645414635145905115199423737692957602597736394332310743897303255319631781249780802009853291
# 12^389-1, difficulty: 421.23, skewness: 1.45
# cost: 5.35474e+23, est. time: 254987760.57 GHz days (not accurate yet!)
# Optimized skew: 1.85168 Murphy: 4.09e-19
skew: 1.85168
c7: 2
c0: -27
Y1: -1
Y0: 1358688135444800959437989819540424878258563941944125720363008
type: snfs