Summary
Connects Claude to the Online Encyclopedia of Integer Sequences through three straightforward tools. You can fetch sequences by their OEIS ID (like A000045 for Fibonacci), search by a list of integer terms to identify unknown sequences, or search by name and keywords to explore related sequences. Reach for this when you're working with mathematical sequences and need quick lookups or pattern identification without leaving your conversation. The Python API is also available standalone if you want to integrate OEIS searches into your own code. Built on the official OEIS API with clean stdio transport.
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mcp-oeis
MCP server for the OEIS (Online Encyclopedia of Integer Sequences) API
mcp-name: io.github.daedalus/mcp-oeis
Install
pip install mcp-oeis
Usage
As an MCP Server
Configure in your MCP settings:
{
"mcpServers": {
"mcp-oeis": {
"command": "mcp-oeis"
}
}
}
Python API
from mcp_oeis import mcp
# Get a sequence by ID
result = mcp.get_sequence_by_id("A000109")
print(result["terms"]) # [1, 1, 1, 2, 5, 14, ...]
# Search by terms
results = mcp.search_by_terms([1, 1, 2, 3, 5, 8])
print(results[0]["name"]) # "Fibonacci numbers"
# Search by name
results = mcp.search_by_name("prime")
print(results[0]["id"]) # "A000040"
MCP Tools
get_sequence_by_id
Get a sequence by its OEIS ID (e.g., "A000109" for simplicial polyhedra, "A000045" for Fibonacci).
search_by_terms
Search OEIS sequences by providing integer terms. For example, searching [1,1,2,3,5,8] will find the Fibonacci sequence.
search_by_name
Search OEIS sequences by name or keyword. For example, searching "Fibonacci" will find Fibonacci-related sequences.
Development
git clone https://github.com/daedalus/mcp-oeis.git
cd mcp-oeis
pip install -e ".[test]"
# run tests
pytest
# format
ruff format src/ tests/
# lint
ruff check src/ tests/
# type check
mypy src/
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