Sequencelib

A platform for formalizing sequences from The On-Line Encyclopedia of Integer Sequences (OEIS).

The main site contains an automatically generated index of the sequences formalized in this repository. You can also find more detailed instructions for developing, building, and contributing.

Quickstart

This project is a standard Lake project, so a running Lean installation is enough for building and contributing. If you are able to use Lean from VSCode, you are ready to use this project by cloning it and opening the root folder in the editor.

Alternative Setup

Alternatively, we also packed a full Lean installation together with the tools needed for building, linting, indexing, and generating the website, in a Nix environment. It is usable in MacOS and Linux.

All that is needed is a Nix installation. Once nix is available, run the environment with

nix develop

We provide a task runner that can run the most common utilities. Run task -a to see all the tasks available. Some examples are:

• task build: builds the project and checks the theorems.
• task lint: run the linters.
• task serve-page: build the site, index, and docs, and serve it locally.

Most of the tasks are simple invocations of lake, but the task manager is useful to ensure all the dependent tasks run in order and to skip over unnecessary work.

Authors

• Walter Moreira
• Joe Stubbs

License

• <a href="https://provables.org/sequencelib/">Sequencelib</a> © 2025 by <a href="https://github.com/waltermoreira">Walter Moreira</a> and <a href="https://github.com/joestubbs">Joe Stubbs</a> is licensed under <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a> <img src="https://mirrors.creativecommons.org/presskit/icons/cc.svg" alt="" style="width: 1em;height:1em;"><img src="https://mirrors.creativecommons.org/presskit/icons/by.svg" alt="" style="width: 1em;height:1em;"><img src="https://mirrors.creativecommons.org/presskit/icons/sa.svg" alt="" style="width: 1em;height:1em;">
• The OEIS is made available under <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a> <img src="https://mirrors.creativecommons.org/presskit/icons/cc.svg" alt="" style="width: 1em;height:1em;"><img src="https://mirrors.creativecommons.org/presskit/icons/by.svg" alt="" style="width: 1em;height:1em;"><img src="https://mirrors.creativecommons.org/presskit/icons/sa.svg" alt="" style="width: 1em;height:1em;">