TAILIEUCHUNG - Báo cáo toán học: "An On-Line Version of the Encyclopedia of Integer Sequences"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học tạp chí toán học quốc tế đề tài: An On-Line Version of the Encyclopedia of Integer Sequences. | An On-Line Version of the Encyclopedia of Integer Sequences N. J. A. Sloane Mathematical Sciences Research Center AT T Bell Laboratories Murray Hill New Jersey 07974 USA June 26 1994 ABSTRACT Twenty-one years after the publication of A Handbook of Integer Sequences a greatly expanded version of this collection can now be accessed by electronic mail. 1. The on-line version A Handbook of Integer Sequences 3 was published by Academic Press in 1973 and contained an annotated list of 2372 sequences arranged in lexicographic order. Since then a great deal of new material has been added and many improvements have been made to the original entries. The purpose of this note is to announce that the new version of the collection The On-Line Encyclopedia of Integer Sequences can now be accessed by electronic mail. To use it send email to sequences@research .att. com containing lines of the form lookup 5 14 42 132 There may be up to five such lines in a message. The program will automatically inform you of the irst seven sequences in the collection that match each line. 2. Background The new version was produced with the assistance of Simon Plouffe of the Université du Quebec à Montréal. By 1991 a cubic meter of new material letters preprints reprints books technical reports all containing new sequences had accumulated in my office and if Simon THE ELECTRONIC JOURNAL OF COMBINATORICS 1 1994 F1 2 Plouffe had not written offering to help the new version would probably never have been produced. This material plus a great deal more that has arrived in the last three years including a considerable amount of electronic mail has been processed and there are now about 5000 sequences in the table. I started collecting sequences in graduate school at Cornell University in 1965 so the collection spans almost thirty years. Getting food at Bell Labs late last night I thought back to all the vending machines I ve used over the years while collecting sequences at Cornell Brown University and

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