2^1447-1

Open composite · C360

NFS Planning

GNFS Murphy estimate: 2.94e-24
SNFS Murphy raw: 1.27e-19
SNFS Murphy normalized (deg 6): 7.96e-20
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.56118

Identifiers

Target expression: 2^1447-1
Target link: FactorDB page
Target ID: 1000000000000001447
Target changed: Before 6/8/2026
Parent query: Same as target
Parent ID: -
Cofactor token: C360
Imported: Jun 07, 2026, 01:40 AM UTC

Raw pmain126 Factorization

57881.1754380423.135870799392023187135247.329476003535938830704093614193630509247.C360

SNFS Polynomial

Polynomial

Degree: 7
Raw Murphy: 1.27e-19
Normalized (deg 6): 7.96e-20
Skew: 1.56118
Selected: Best

n: 856631435641652097983331949395130972414349984918134546384458186357154008655372818285098415757558724780631919155634142527119631720357811565971652978354806353043246788790922518340580718818779649118786595588047680872812920535007229585877563009894870311687811359411312900628148886444280632562856541662314251609495658955563532828619181232758356396480759694285870081
# 2^1447-1, difficulty: 436.19, skewness: 1.22
# cost: 1.22326e+24, est. time: 582506976.88 GHz days (not accurate yet!)
# Optimized skew: 1.56118 Murphy: 1.27e-19
skew: 1.56118
c7: 1
c0: -4
Y1: -1
Y0: 205688069665150755269371147819668813122841983204197482918576128
type: snfs