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Related software and databases
From OeisWiki
There is a number of OEIS-related software projects and derived databases, among them:
- OEIS-mat – maintenance, broken-link and consistency checks, working lists for mass editing etc., maintained by OEIS-User Georg Fischer
- jOEIS – Java implementation of OEIS sequences (currently about 58000), by OEIS-User Sean A. Irvine
- joeis-lite – a small subset of jOEIS used for Java code generation and testing, by Georg Fischer
- sequencedb.net – automatically generated sequences, by Jon Maiga (Email: jon at jonkagstrom dot com), as of May 29, 2019: “A database with 2071066 machine generated integer and decimal sequences”
- ISFA – a database of Integer Sequence Formulas and Applications, by Enxhell Luzhnica, Jacobs University Bremen. The integer sequence formulas are parsed from the OEIS. Cf. also: Enxhell Luzhnica and Michael Kohlhase, Formula Semantification and Automated Relation Finding in the On-line Encyclopedia for Integer Sequences.
- Sage OEIS queries in Sage
Other mathematical databases
- Catalog of Mathematical Databases
- The Combinatorial Object Server++, originally by Frank Ruskey, now at the University of Erlangen
Unauthorized copies and proxy servers
From time to time pages appear in the Internet which have almost the same look and feel as the original OEIS pages, but which are served from a different domain, mostly by the aid of a so-called proxy server. Such sites often wrap the original OEIS pages with some advertisement.
Such sites have the potential to grab user identities and passwords (phishing sites). OEIS users should always make sure that they log into the system with the URL https://oeis.org/login only.