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| The On-Line Encyclopedia of Integer Sequences | Search for a title, author or keyword | ||||||||
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The On-Line Encyclopedia of Integer Sequences by OEIS Foundation Inc. The OEIS Foundation Inc. is a New Jersey nonprofit corporation. The On-Line Encyclopedia of Integer Sequences® ( OEIS® ) is the on-line version of a database of sequences of numbers. The main use for the OEIS is to identify a number sequence that you have come across, perhaps in your work, while reading a book, or in a quiz, etc. For example, you discover what you think may be a new algorithm for checking that a file of medical records is in the correct order. To handle files of 1, 2, 3, 4, ... records, your algorithm takes 0, 1, 3, 5, 9, 11, 14, 17, 25, ... steps. How can you check if someone has discovered this algorithm before? You decide to ask the OEIS if this sequence has appeared before in the scientific literature. The reply tells you that this is sequence A3071, which is the number of steps needed for "sorting by list merging", a well-known algorithm. The On-Line Encyclopedia of Integer Sequences reached 200,000 sequences at midnight on December 1, 2011, the 200000-th sequence being A201463.
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