OEIS . The Online Encyclopedia for Integer Sequneces, is a database or encyclopedia of integer sequences available on the Internet at the URL: http://www.research.att.com/~njas/sequences
It is the work of compilation by more than 40 years of Neil Sloane, (author of the books: A Handbook of Integer sequences , 1973 and The Encyclopedia of Integer Sequences , 1995 each with 2400 and 5487 sequences respectively.), And several volunteers in Internet that contribute to maintaining the web edition. Many of whom are mathematicians by profession or scientists from other branches, but there are also fans of mathematics and computing .
As of May 2010, the database had more than 170,000 integer sequences. Among them is the well-known sequence of [[prime numbers]] ( A000040 ). Each of these entries contains the first terms, name, training formulas (if they exist), comments, references to books and articles, programs to generate them, among other interesting data. Each sequence is identified by a unique number.
The sequences in the encyclopedia come mainly from Number Theory , Combinatorics , Algebra , Games, Computer Science , Engineering , Physics , Chemistry , and more.
In 1998 Sloane founded the Journal of IntegerSequences dedicated to the publication of articles dealing with integer sequences. There is also a wiki and another parallel resource to the encyclopedia, the Journal and the aforementioned wiki is the mailing list [1] which is a space to discuss the sequences in the encyclopedia and possible new contributions.
