mathlas: free math tool for AI that checks answers with real math systems
mathlas is a free MCP tool that lets AI assistants like Claude or ChatGPT hand off math problems to verified mathematical systems instead of guessing. It checks results using OEIS, Lean, and PSLQ — making AI-generated math far more reliable.
AI language models are good at writing and reasoning in text, but they frequently get math wrong. They predict numbers the same way they predict words, which means answers can look plausible but still be incorrect. mathlas plugs into AI assistants as an MCP tool — a standard way for AI to call external programs — so whenever the AI hits a math problem, it can delegate the calculation to mathlas rather than guessing on its own.
The tool verifies answers using three established math systems: OEIS, a database of hundreds of thousands of known number sequences; Lean, software that mechanically checks whether a mathematical proof is actually correct; and PSLQ, an algorithm for detecting exact integer relationships between numbers. It's free to use and straightforward to connect to any MCP-compatible AI setup, making it a practical option for developers who need trustworthy math in their AI-assisted workflows.
Key points
- Connects to AI assistants (Claude, ChatGPT, etc.) via MCP so the AI delegates math to a real math engine
- Uses OEIS, Lean, and PSLQ to verify results — no LLM guessing involved
- Reduces the common problem of AI confidently producing wrong calculations
- Free to use and compatible with any MCP-supporting AI environment
- Useful for coding, data analysis, or any task where math accuracy matters
Quick term guide
- AI assistant
- A software tool that uses artificial intelligence to answer questions or help with tasks.
- PSLQ
- An algorithm that finds exact whole-number relationships hidden between a set of numbers.
- models
- Different AI engines that can power answers or code suggestions inside a tool.
- reasoning
- The ability of the AI to think through complex steps to find a solution.
- database
- A large collection of organized data used for search and analysis.
- developers
- Developers are people who build software, apps, or websites.
- workflow
- A repeatable set of steps for getting a task done.
- port
- A specific virtual door on your computer used by apps to send and receive information.