12-

12^397-1

Open composite · C353

NFS Planning

GNFS Murphy estimate: 7.49e-24
SNFS Murphy score: 2.18e-19
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.30038

Identifiers

Target expression: 12^397-1
Target link: FactorDB page
Target ID: 1100000000013092266
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C353
Imported: Jun 03, 2026, 04:32 PM UTC

Raw pmain126 Factorization

(1) 905531593.87308026121845697533.28507326839627578413926541831734308884929877181.C353

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 2.18e-19
Skew: 1.30038
Selected: Best

n: 10981147474685601244755560483971252998888760134147574255725393913112003204539374258719942768153060985097787145201846638167842731838198174996539402935141244973237205236581422214358123950972281599107494119793173292869589583820055624525292797801863929407623947698666988001316505966362957353119373330135342901774293938580323397072191927376524674717458887629
# 12^397-1, difficulty: 429.39, skewness: 1.02
# cost: 8.41956e+23, est. time: 400931612.74 GHz days (not accurate yet!)
# Optimized skew: 1.30038 Murphy: 2.18e-19
skew: 1.30038
c7: 8
c0: -9
Y1: -1
Y0: 16304257625337611513255877834485098539102767303329508644356096
type: snfs