OEIS MCP Server

An MCP server that allows agents to identify integer sequences from observed terms, search the OEIS using query syntax, and retrieve detailed entry data including formulas, programs, b-files, and cross-references. It supports STDIO or Streamable HTTP transports and requires no API key.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by cyanheads

Vendor documentation

What you can do with it

Identify sequences from a list of consecutive terms
Search OEIS using keywords or term lists
Retrieve formulas and programs for a sequence
List cross-references for a specific entry

Source and maintenance

Community listingRegistry 0.1.3

mcp-registry: io.github.cyanheads/oeis-mcp-server@0.1.3 Source repository

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@cyanheads/oeis-mcp-server 0.1.3

npmnpx

@cyanheads/oeis-mcp-server package definition

{
  "version": "0.1.3",
  "transport": "stdio",
  "identifier": "@cyanheads/oeis-mcp-server",
  "runtimeHint": "npx",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "MCP_LOG_LEVEL",
      "format": "string",
      "default": "info",
      "description": "Sets the minimum log level for output (e.g., 'debug', 'info', 'warn')."
    },
    {
      "name": "OEIS_QUEUE_MAX_WAIT_MS",
      "format": "number",
      "default": "30000",
      "description": "Longest a call waits in the oeis.org request queue (paced to one start per 10 s) before failing with RateLimited and retryAfter, in milliseconds."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "oeis-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/oeis-mcp-server@0.1.3"
      ],
      "env": {
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "OEIS_QUEUE_MAX_WAIT_MS": "<YOUR_OEIS_QUEUE_MAX_WAIT_MS>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "oeis-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/oeis-mcp-server@0.1.3"
      ],
      "env": {
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "OEIS_QUEUE_MAX_WAIT_MS": "<YOUR_OEIS_QUEUE_MAX_WAIT_MS>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "oeis-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/oeis-mcp-server@0.1.3"
      ],
      "env": {
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "OEIS_QUEUE_MAX_WAIT_MS": "<YOUR_OEIS_QUEUE_MAX_WAIT_MS>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "oeis-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/oeis-mcp-server@0.1.3"
      ],
      "env": {
        "MCP_LOG_LEVEL": "<YOUR_MCP_LOG_LEVEL>",
        "OEIS_QUEUE_MAX_WAIT_MS": "<YOUR_OEIS_QUEUE_MAX_WAIT_MS>"
      }
    }
  }
}

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