2^1237-1

Open composite · C303

NFS Planning

GNFS Murphy estimate: 5.95e-21
SNFS Murphy score: 1.72e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 1.54197

Identifiers

Target expression: 2^1237-1
Target link: FactorDB page
Target ID: 1000000000000001237
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C303
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

2538207129840687799335203259492870476186248896616401346500027311795983.C303

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 1.72e-17
Skew: 1.54197
Selected: Best

n: 932346997627937198512116805585638652223533192516806816522982865866804199262267590070758266268742758283545150004345986721379992894347882545052483695173645594473520682900937642680132877292150643356579486299211525438560741941531670625397281199369604215535391846857906233364905825622441048803673998858526737
# 2^1237-1, difficulty: 372.98, skewness: 1.22
# cost: 3.28154e+22, est. time: 15626373.88 GHz days (not accurate yet!)
# Optimized skew: 1.54197 Murphy: 1.72e-17
skew: 1.54197
c7: 1
c0: -4
Y1: -1
Y0: 191561942608236107294793378393788647952342390272950272
type: snfs