# Number Theory Toolkit

> Provide number theory algorithm implementations and guidance

- Skill: `a5c-ai/number-theory-toolkit` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add a5c-ai/number-theory-toolkit`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/number-theory-toolkit/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/number-theory-toolkit

---


# Number Theory Toolkit Skill

## Purpose

Provide implementations and guidance for number theory algorithms commonly used in competitive programming.

## Capabilities

- Modular arithmetic operations
- Extended Euclidean algorithm
- Chinese Remainder Theorem
- Modular inverse and exponentiation
- FFT/NTT for polynomial multiplication
- Linear sieve implementations

## Target Processes

- number-theory-algorithms
- prime-algorithms
- combinatorics-counting

## Algorithm Catalog

### Modular Arithmetic
- Modular exponentiation (binary exp)
- Modular inverse (Fermat/Extended GCD)
- Modular square root (Tonelli-Shanks)

### GCD and Extensions
- Euclidean algorithm
- Extended Euclidean algorithm
- Linear Diophantine equations

### Chinese Remainder Theorem
- CRT for coprime moduli
- General CRT

### FFT/NTT
- Fast Fourier Transform
- Number Theoretic Transform
- Polynomial multiplication

## Input Schema

```json
{
  "type": "object",
  "properties": {
    "algorithm": { "type": "string" },
    "parameters": { "type": "object" },
    "language": {
      "type": "string",
      "enum": ["cpp", "python", "java"]
    },
    "modulo": { "type": "integer" }
  },
  "required": ["algorithm"]
}
```

## Output Schema

```json
{
  "type": "object",
  "properties": {
    "success": { "type": "boolean" },
    "code": { "type": "string" },
    "explanation": { "type": "string" },
    "complexity": { "type": "string" }
  },
  "required": ["success"]
}
```