2^1213-1

Open composite · C297

NFS Planning

GNFS Murphy estimate: 1.33e-20
SNFS Murphy score: 3.11e-17
Preferred method: SNFS
SNFS possible: Yes
SNFS degree: 7
SNFS skew: 0.96529

Identifiers

Target expression: 2^1213-1
Target link: FactorDB page
Target ID: 1000000000000001213
Target changed: -
Parent query: Same as target
Parent ID: -
Cofactor token: C297
Imported: Jun 03, 2026, 04:29 PM UTC

Raw pmain126 Factorization

327511.715079841864486572798550389025242773233223013545064445043124471.C297

SNFS Polynomial

Polynomial

Degree: 7
Murphy: 3.11e-17
Skew: 0.96529
Selected: Best

n: 602288143593720536806089286738709175972359125227761761564073227910379498285174671775644305722270614135100412938071141915024322878163325882047318951741757889916312348536315125683454292668478299147363953500168798099737705487101263107775268036487596518883077658199869205832214060428355682611836617711
# 2^1213-1, difficulty: 365.15, skewness: 1.22
# cost: 2.04479e+22, est. time: 9737102.06 GHz days (not accurate yet!)
# Optimized skew: 0.96529 Murphy: 3.11e-17
skew: 0.96529
c7: 1
c0: -4
Y1: -11972621413014756705924586149611790497021399392059392
Y0: 1
type: snfs