2^1207-1

Open composite · C337

NFS Planning

GNFS Murphy estimate: 6.35e-23
SNFS Murphy score: 6.89e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 8
SNFS skew: 1.24930

Identifiers

Target expression: 2^1207-1
Target link: FactorDB page
Target ID: 1000000000000001207
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C337
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

(17,71) C337

SNFS Polynomial

Polynomial

Degree: 8
Murphy: 6.89e-17
Skew: 1.24930
Selected: Best

n: 7121450524338129034228935888406290342440924878292924475154549706165967683018106989365212535726088820424187252154592086367126609115652316059905387197810171357101484623269226530219357641629634637632902818929376633641165995708421341209033069328278856607776384578328080846029713646218471064646270016968312691054210973840071649700163924918271
# 2^1207-1, difficulty: 341.97, skewness: 1.00
# cost: 4.85576e+21, est. time: 2312266.21 GHz days (not accurate yet!)
# Optimized skew: 1.24930 Murphy: 6.89e-17
skew: 1.24930
c8: 1
c7: 1
c6: -7
c5: -6
c4: 15
c3: 10
c2: -10
c1: -4
c0: 1
Y1: -2361183241434822606848
Y0: 5575186299632655785383929568162090376495105
type: snfs