The On-Line Encyclopedia of Integer Sequences (OEIS)

Business Profile

Core Value Proposition

The On-Line Encyclopedia of Integer Sequences (OEIS) provides an online, collaboratively maintained database of integer sequences that users can search, browse, and contribute to.

Target Customer

Mathematicians, researchers, educators, students, and other users who need information on integer sequences and their properties.

Key Differentiator

Community-driven with a core group of editors (about 130) who review submissions; allows anyone to propose a new sequence or update after registering; rich sequence entries with multiple viewing and export options (list, graph, refs, listen, history, text, internal format, table).

Implementation Timeline

Users can access and search immediately after visiting; to contribute, registration is required, after which submissions are reviewed by editors. Specific timeframes for reviews are not stated.

Pain Points

1Need for a comprehensive, searchable repository of integer sequences with rich metadata and cross-references.
2 Desire to contribute new sequences or updates in a controlled, editorially reviewed process.
3Need for multiple representations and tools to analyze and use sequences (graphs, downloadable formats, MIDI listening, history of changes).

Key Features

1Search by sequence, by word, or by sequence number on the main lookup page.
2Entry-specific tools: list, graph, refs, listen, history, text, internal format, and sometimes table/edit.
3Browse via an index; see adjacent sequences and sequences in context for navigation.
4WebCam browse for recent additions and topics; Superseeker for sequence identification; downloadable formats (b-files, names list).
5Submission and editing workflow: registration required to contribute; a group of editors reviews submissions.

Target Customer Industries

Decision Makers

1Editor
2Ombudsman

Client Results

1Access to a database containing 389,408 sequences (as of the page snapshot).
2Entries include sequence beginning terms, descriptions, graphs, references, cross-references, and more.
3Various outputs available from a single entry (lists, graphs, MIDI listening, textual sections, and formats suitable for exporting to other software).

Competitive Advantages

1Extensive, continuously growing repository of sequences with editorial oversight.
2Rich, multi-format entries and a wide set of viewing tools (graphs, lists, tables, listen, history).
3Open to public contributions via a registration-based workflow, enabling community growth and updates.

Key Benefits

1Comprehensive, up-to-date indexing of a vast number of sequences.

2Multiple ways to explore and analyze sequences (graphs, lists, references, history, audio, formats for export).

3Ability to contribute new sequences or updates, subject to editorial review.

4Cross-references and context (adjacent sequences, related entries) to aid discovery.

Additional Product Information

Product Description

An online database of integer sequences that supports searching, browsing, viewing sequence details, and contributing new sequences or edits; maintained by The OEIS Foundation with donor support.

Target Market

Academia, education, and research communities engaged in mathematics and related sciences, as well as individual researchers and students needing sequence information.

Unique Value Proposition

A large, community-maintained encyclopedia of integer sequences with editor-reviewed submissions, rich sequence metadata, and a suite of interactive tools for exploration and analysis.

Technical Requirements

Cookies must be enabled to log in; registration is required to contribute; some features (like MIDI listening and media downloads) may require browser support.

Pricing Model

Funded by donations to The OEIS Foundation; no explicit pricing information provided.

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