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Oeis MCP server

online · 100% uptime
by cyanheads·io.github.cyanheads/oeis-mcp-server·v0.1.3
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Identify integer sequences by terms, search the OEIS, read formulas, programs, b-files, cross-refs.

A92/100grade A
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A92/100

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If you have run it, two minutes of your experience saves the next person an afternoon.

Oeis tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Not scanned yet. New listings are scanned within a day or two of arriving.

How Oeis compares

Against every graded Web search MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
92/100
higher than 90% of 3,470 Web search servers
Uptime
100%
of our recent checks; the typical remote Web search server answers 100%
Response time
569 ms
faster than 25% of 2,238 Web search servers

Release history: 3 versions in the registry since 2026-10-01, latest 2026-10-18, typically one every 16 days.

Install Oeis in Claude Code, Cursor or VS Code

claude mcp add --transport http oeis-mcp-server https://oeis.caseyjhand.com/mcp
Add to Cursor

What the publisher says

From the Oeis repository's README, as published. We do not edit it. Read it on GitHub

@cyanheads/oeis-mcp-server Identify integer sequences by terms, search the OEIS, read formulas, programs, b-files, cross-refs via MCP. STDIO or Streamable HTTP. 6 Tools • 1 Resource

Overview

Integer sequences from the On-Line Encyclopedia of Integer Sequences (OEIS). Identify a sequence from a few observed terms, search with OEIS's own query syntax, read an entry's formulas, generating functions, and programs, page through extended terms from its b-file, and walk its cross-references. Answers come from the OEIS entries themselves, each linked to its page. Runs as a stdio process or a local Streamable HTTP server, with no API key.

Tools

Resources

The same record is available through oeisgetsequence for clients that only call tools.

Capability reference

oeisidentifysequence tool

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Oeis: common questions

Is Oeis MCP server safe?
Yes, by our scan: it is graded A (92/100). Read the Oeis safety report
How do I install Oeis?
It runs remotely at oeis.caseyjhand.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Oeis need an API key?
No secret keys are declared. It reads 9 settings from the environment.
Is Oeis maintained?
The last commit was 34 days ago (2026-10-01). The latest release is v0.1.3.
Is Oeis up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Oeis?
Servers from other publishers that do the same job: Repomix MCP server, ThoughtDAG MCP server and Everything Search MCP server.
How does Oeis compare with other Web search MCP servers?
safety score 92/100 (higher than 90% of 3,470 Web search servers); uptime 100% (of our recent checks; the typical remote Web search server answers 100%); response time 569 ms (faster than 25% of 2,238 Web search servers). Full comparison.

Alternatives to Oeis

Same job from other publishers: the closest match first, then the best rated.

  • Repomix
    Pack local or remote codebases into AI-friendly files that LLMs and coding agents can read or search
    A
  • ThoughtDAG
    Search local AI conversations by file or phrase and recall source turns. Four read-only tools.
    A
  • Everything Search
    Fast file search: Everything SDK on Windows, Spotlight (mdfind) on macOS, locate/plocate on Linux.
    A
  • Vexor
    A semantic search engine for files and code.
    B
  • fojin — Buddhist Canon Tools
    Buddhist canon tools: search, passages, cross-canon parallels, dictionaries — all URN-cited.
    A

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