12-

12^355-1

Open composite · C222

NFS Planning

GNFS Murphy estimate: 2.97e-16
SNFS Murphy score: 4.19e-16
Preferred method: Similar
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.32480

Identifiers

Target expression: 12^355-1
Target link: FactorDB page
Target ID: 1100000000013092132
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C222
Imported: Jun 03, 2026, 04:32 PM UTC

Raw pmain126 Factorization

(1,5,71) 20566571.88464749119871.31962706412313274963681.7236752191522524732101749054968713881.C222

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 4.19e-16
Skew: 0.32480
Selected: Best

n: 322732491985076335885570205119737059176609605247307351012673813228177411729830037552438344800952989819187947484590985198367498811266954608127923342102902418879919605118843835344614906435312863585687161592827571775369247721
# 12^355-1, difficulty: 306.49, skewness: 0.29
# cost: 4.77585e+20, est. time: 227421.52 GHz days (not accurate yet!)
# Optimized skew: 0.32480 Murphy: 4.19e-16
skew: 0.32480
c8: 20736
c6: 1728
c4: 144
c2: 12
c0: 1
Y1: -1
Y0: 59066822915424320448445358917464096768
type: snfs