7^457-1

Open composite · C386

NFS Planning

GNFS Murphy estimate: 9.13e-26
SNFS Murphy score: 5.97e-18
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.37531

Identifiers

Target expression: 7^457-1
Target link: FactorDB page
Target ID: 1000000000018628755
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C386
Imported: Jun 03, 2026, 04:31 PM UTC

Raw pmain126 Factorization

(1) C386

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 5.97e-18
Skew: 1.37531
Selected: Best

n: 27017989970625580911264011972787984914441271437567657860633858855515492242329802844335892591999361025480674799299240633801324650265575942183550615430879545566643234002801457324693975012255035877809481298338948145794461637633180773498387333587605450938300798091500608072444682706111038508156203660170191795362763877240803338749239259482365673457291733891822019828709234788700313875839201
# 7^457-1, difficulty: 386.21, skewness: 1.74
# cost: 7.20441e+22, est. time: 34306707.53 GHz days (not accurate yet!)
# Optimized skew: 1.37531 Murphy: 5.97e-18
skew: 1.37531
c7: 1
c0: -49
Y1: -8538323413450849900970017037940802745289307058918668807
Y0: 1
type: snfs