---
id: "oeis_id"
kind: "datatype"
status: "draft"
is_pii: false
categories: ["science", "identifiers"]
langs: ["common"]
quality: 80
url: "https://registry.apicrafter.io/datatype/oeis_id"
---

# OEIS sequence number (A-number) (`oeis_id`)

> **Draft.** Draft records have not been reviewed yet and may be incomplete or wrong; do not treat them as authoritative for legal or compliance decisions.

Identifier of an integer sequence in the On-Line Encyclopedia of Integer Sequences, the letter A and six digits with leading zeros, as in A000045. The older M-numbers and N-numbers of the printed editions are not covered.

- Personal data (PII): no
- Categories: Scientific (science), Universal unique identifiers (identifiers)
- Countries: global
- Languages: Common to most languages (common)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^A\d{6}$
```

## Examples

- `A000040` — The prime numbers
- `A000045` — The Fibonacci sequence
- `A315` (invalid example) — Without leading zeros

## Translations

- ru: Номер последовательности OEIS

## Sources

- wikipedia: <https://en.wikipedia.org/wiki/On-Line_Encyclopedia_of_Integer_Sequences>

## Quality

Score 80/100. Missing: mapping (Wikidata, Schema.org, ...), detector coverage.

JSON: <https://registry.apicrafter.io/api/v1/datatypes/oeis_id.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/any/science/oeis_id.yaml>