Search / io.github.cyanheads/oeis-mcp-server
protogridR0· no sign-inIdentify integer sequences by terms, search the OEIS, read formulas, programs, b-files, cross-refs.
v0.1.3 · active · repository · descriptor JSON · versions
{
"mcpServers": {
"oeis-mcp-server": {
"type": "http",
"url": "https://oeis.caseyjhand.com/mcp"
}
}
}claude mcp add --transport http oeis-mcp-server https://oeis.caseyjhand.com/mcp[mcp_servers.oeis-mcp-server]
url = "https://oeis.caseyjhand.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"oeis-mcp-server": {
"type": "remote",
"url": "https://oeis.caseyjhand.com/mcp",
"enabled": true
}
}
}{
"mcpServers": {
"oeis-mcp-server": {
"type": "http",
"url": "https://oeis.caseyjhand.com/mcp"
}
},
"deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=oeis-mcp-server&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vb2Vpcy5jYXNleWpoYW5kLmNvbS9tY3AifQ%3D%3D"
}{
"servers": {
"oeis-mcp-server": {
"type": "http",
"url": "https://oeis.caseyjhand.com/mcp"
}
}
}{
"mcpServers": {
"oeis-mcp-server": {
"httpUrl": "https://oeis.caseyjhand.com/mcp"
}
}
}extensions:
"oeis-mcp-server":
enabled: true
name: "oeis-mcp-server"
type: streamable_http
uri: "https://oeis.caseyjhand.com/mcp"
timeout: 300
protocol.modernsupports 2026-07-28 (server/discover)protocol.statelessanswers without a sessionprotocol.transportstreamable HTTPprotocol.list_ttltools/list declares ttlMs 0, so clients re-fetch it on every useauth.prm, auth.as_metadata, auth.cimdno remote uses OAuthauth.secret_in_urlno templated URLtools.descriptionsevery tool has a descriptiontools.description_lengthdescriptions are concisetools.schemasevery tool has an object input schematools.annotations6 of 6 tools declare readOnlyHint or destructiveHinttools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: oeis_identify_sequence (destructiveHint); oeis_search_sequences (destructiveHint); oeis_get_cross_refs (destructiveHint); …tools.token_costabout 2,188 tokens to load every tooltools.api_dumptools are not a one-to-one API dumpstability.changes2 tool changes in 30 daysstability.rug_pullno tool changed its meaning under the same namedeps.known_vulns, deps.mcp_sdk_version, deps.resolvabledeps.dev does not know @cyanheads/[email protected], @cyanheads/[email protected]oeis_get_termschangeddescription, input schema, output schemaList 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 about 100,000 bytes, or at the end of one 1 MiB part of a larger b-file, whichever comes first; nextFromIndex continues it.
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 bytes, or at the end of one 1 MiB part of a larger b-file, whichever comes first; nextFromIndex continues it.
oeis_search_sequenceschangedinput schema, output schemaFull history: list_changes · trend: quality JSON.
Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.
+repository +namespace-matches-repo +reachable +uptime-100% +updated-2d-ago
Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.
@cyanheads/[email protected] npmthis version is not known to the dependency resolver
@cyanheads/[email protected] npmthis version is not known to the dependency resolver
Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.
| remote | auth | reachable | uptime 30d | p50 | protocol | last ok |
|---|---|---|---|---|---|---|
https://oeis.caseyjhand.com/mcp streamable-http | none | yes | 100% | 219 ms | 2026-07-28 | 2026-10-20 |
| package | registry | version | runtime | secrets |
|---|---|---|---|---|
@cyanheads/oeis-mcp-server | npm | 0.1.3 | npx | |
@cyanheads/oeis-mcp-server | npm | 0.1.3 | npx |
oeis_get_cross_refsread-only | 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 terms. 10 rows per page. |
oeis_get_sequenceread-only | 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 sections together exceed 24,000 characters of serialized JSON, the core fields come back with a section outline instead; call again with sections to pick what to read. A selection past 100,000 bytes comes back in parts cut between items: pass nextFromItem as fromItem, with the same sections, for the next part. |
oeis_get_termsread-only | 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 bytes, or at the end of one 1 MiB part of a larger b-file, whichever comes first; nextFromIndex continues it. |
oeis_identify_sequenceread-only | 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 disagree on where a sequence starts. OEIS matches only the first terms of each entry (its data line, at most about 270 characters), not its b-file, so a run from far into a sequence is not found. Takes up to 60 terms, each an integer of at most 200 digits or the wildcard _ for one unknown term. |
oeis_list_referenceread-only | 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). |
oeis_search_sequencesread-only | 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_identify_sequence is the direct route. |
Schemas: list_tools.
And 140 more from this publisher.
{
"name": "io.github.cyanheads/oeis-mcp-server",
"$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
"remotes": [
{
"url": "https://oeis.caseyjhand.com/mcp",
"type": "streamable-http"
}
],
"version": "0.1.3",
"packages": [
{
"version": "0.1.3",
"transport": {
"type": "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."
}
]
},
{
"version": "0.1.3",
"transport": {
"url": "http://localhost:3010/mcp",
"type": "streamable-http"
},
"identifier": "@cyanheads/oeis-mcp-server",
"runtimeHint": "npx",
"registryType": "npm",
"registryBaseUrl": "https://registry.npmjs.org",
"environmentVariables": [
{
"name": "MCP_TRANSPORT_TYPE",
"value": "http",
"format": "string",
"description": "Selects the HTTP transport."
},
{
"name": "MCP_HTTP_HOST",
"format": "string",
"default": "127.0.0.1",
"description": "The hostname for the HTTP server."
},
{
"name": "MCP_HTTP_PORT",
"format": "string",
"default": "3010",
"description": "The port to run the HTTP server on."
},
{
"name": "MCP_HTTP_ENDPOINT_PATH",
"format": "string",
"default": "/mcp",
"description": "The endpoint path for the MCP server."
},
{
"name": "MCP_AUTH_MODE",
"format": "string",
"default": "none",
"description": "Authentication mode to use: 'none', 'jwt', or 'oauth'."
},
{
"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."
}
]
}
],
"repository": {
"url": "https://github.com/cyanheads/oeis-mcp-server",
"source": "github"
},
"description": "Identify integer sequences by terms, search the OEIS, read formulas, programs, b-files, cross-refs."
}