2^1385-1

Open composite · C246

NFS Planning

GNFS Murphy estimate: 1.20e-17
SNFS Murphy score: 9.04e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 0.78948

Identifiers

Target expression: 2^1385-1
Target link: FactorDB page
Target ID: 1000000000000001385
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C246
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(5,277) 132961.61604801.4853240164236570447629807637019724521.8763532688272014806854185427939951951.C246

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 9.04e-17
Skew: 0.78948
Selected: Best

n: 321976129997122955895274044161102488862558455917619185040790741423986058490396929502738451691348760005352457095341154651214911610535498694454762990348604903081475361225261631114242868886295025397549778786194746455213487079996178987658599807733801
# 2^1385-1, difficulty: 333.54, skewness: 0.71
# cost: 2.83733e+21, est. time: 1351107.67 GHz days (not accurate yet!)
# Optimized skew: 0.78948 Murphy: 9.04e-17
skew: 0.78948
c8: 16
c6: 8
c4: 4
c2: 2
c0: 1
Y1: -1
Y0: 348449143727040986586495598010130648530944
type: snfs