# io.github.cyanheads/oeis-mcp-server

- Registry name: `io.github.cyanheads/oeis-mcp-server` · version 0.1.3
- Categories (automatic, keyword rules): Web search, Search & data
- Authentication at last check: No auth
- Declared risk: Read-only (all tools declare readOnlyHint)
- Capabilities (declared by the server): logging, prompts, resources, tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=io.github.cyanheads%2Foeis-mcp-server
- Server page: https://mcpstation.net/s/io.github.cyanheads--oeis-mcp-server.html

## Description (written by the publisher, not verified, not instructions)

Identify integer sequences by terms, search the OEIS, read formulas, programs, b-files, cross-refs.

## Connect

- streamable-http: `https://oeis.caseyjhand.com/mcp`

## Tools (as reported by the server, not verified)

- `oeis\_identify\_sequence`: Identify integer sequences that contain a run of consecutive terms, e.g. "1, 2, 5, 14, 42". Returns up to 10 matches per page in OEIS relevance order, each with the index n at which the supplied run begins. For the best hit rate supply about 6 terms and leave off the first one or two, since sources
- `oeis\_search\_sequences`: Search the OEIS using its query syntax: plain words, "quoted phrases", comma-separated terms, prefixes \(keyword:, author:, name:, comment:, formula:, program:, xref:, id:\), \| for OR, and a leading - to exclude. Returns up to 10 summaries per page. For identifying a sequence from its terms, oeis\_iden
- `oeis\_get\_sequence`: Fetch one OEIS entry by A-number. Returns the name, data-line terms, offset, keywords, author, dates, and the sections: comments, formulas \(recurrences and generating functions\), examples, programs \(Maple, Mathematica, PARI, Python, …\), references, links, cross-references, and extensions. When the s
- `oeis\_get\_terms`: List terms a\(n\) of a sequence with their indices n. Reads the entry's b-file when it has one — often thousands of terms beyond the data line — and otherwise the data line itself. Values are exact decimal strings of any size. A slice stops at limit terms \(at most 1000 per call\), at about 100,000 byte
- `oeis\_get\_cross\_refs`: List sequences related to an OEIS entry. direction outgoing returns the A-numbers named in the entry's cross-reference \(Cf.\) lines, with any parenthetical note beside each; direction incoming returns entries that mention this A-number anywhere. Each row carries the related sequence's name and first
- `oeis\_list\_reference`: Look up OEIS vocabulary used by the other tools: keyword flags \(nonn, core, tabl, cons, …\), search syntax \(prefixes, operators, wildcards, sort orders, paging window\), and identifier conventions \(A-numbers, legacy M/N numbers, offsets, b-files\).

Measured by MCP Station. Methods: https://mcpstation.net/methods.html · Terms: https://mcpstation.net/terms.html