Tuesday, November 09, 2004


Encyclopedia of Integer Sequences

You may at some time have taken a test in which you were asked a question like "What's the next number in the following sequence? 0, 1, 1, 2, 3, 5, 8, 13 ... "

The answer is 21, and this sequence is known as the Fibonacci sequence. Each term is the sum of the previous two terms.

There is an entire encyclopedia of sequences like this, the Encyclopedia of Integer Sequences, which recently passed the 100,000 entry mark. Started by mathematician Neil J. A. Sloane in 1963 on punched cards, the Encyclopedia is now a major research tool and collaborative database.

Here are some sequences contributed by yours truly:I also contributed a comment and bibliographical reference to sequence A069283.

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