[4] Sloane is president of the OEIS Foundation. Neil Sloane President at The OEIS Foundation, Inc Greater New York City Area 500+ connections Besides integer sequences, the OEIS also catalogs sequences of fractions, the digits of transcendental numbers, complex numbers and so on by transforming them into integer sequences. This line of thought leads to the question "Does sequence An contain the number n ?" First numerator and then denominator of the central. Videos featuring Neil on Numberphile. Speaker: Neil Sloane Date: Oct. 10, 2019 Abstract: Some favorite old and new problems: Dissections; roots of theta series; the Recaman hypothesis; getting to … Mathematical and Social Factors Explain the Distribution of Numbers in the OEIS", "The Encyclopedia of Integer Sequences (N. J. 1 We state rigorously-computed explicit expressions for the … , is catalogued as the numerator sequence 1, 1, 1, 2, 1, 3, 2, 3, 4 (A006842) and the denominator sequence 5, 4, 3, 5, 2, 5, 3, 4, 5 (A006843). Neil Sloane curates the Online Encyclopedia of Integer Sequences (OEIS) from his attic home office in Highland Park, N.J. John Smock for Quanta Magazine Facebook Twitter Each entry contains the leading terms of the sequence, keywords, mathematical motivations, literature links, and more, including the option to generate a graph or play a musical representation of the sequence. At the time of the launch, the OEIS contained 180284 sequences. Enciclopedia on-line a secvențelor întregi (The On-Line Encyclopedia of Integer Sequences, OEIS), citată și ca Sloane's, este o bază de date online cu secvențe întregi. Occasionally −1 is used for this purpose instead, as in A094076. Every sequence is identified by the letter A followed by six digits, almost always referred to with leading zeros, e.g., A000315 rather than A315. A lot of them are not, unfortunately. [11] A300000 was defined in February 2018, and by end of July 2020 the database contained more than 336,000 sequences. I started collecting sequences when I was a graduate student at Cornell University in 1964. Neil recently turned 76 but his passion for mathematics remains as strong as ever. According to Neil Sloane, as narrated in the Brief History of the OEIS, the very first sequence, the one that "started it all", is OEIS sequence A435 (The 7th sequence from the bottom of this historic page labeled "W n,1, p. 44" and that starts as follows: . {\displaystyle \textstyle {1 \over 5},{1 \over 4},{1 \over 3},{2 \over 5},{1 \over 2},{3 \over 5},{2 \over 3},{3 \over 4},{4 \over 5}} ) Year-end message from Neil Sloane: The OEIS is unique, free, priceless. In comments, formulas, etc., a(n) represents the nth term of the sequence. OEIS. 5 references to applicable articles in journals, links to text files which hold the sequence terms (in a two column format) over a wider range of indices than held by the main database lines, links to images in the local database directories which often provide combinatorial background related to graph theory, others related to computer codes, more extensive tabulations in specific research areas provided by individuals or research groups, This page was last edited on 30 November 2020, at 21:19. When the database reached 10,000 sequences in 1996, I put it on the web as the "On-Line Encyclopedia of Integer Sequences" (the OEIS). Neil James Alexander Sloane. [5] The database was at first stored on punched cards. Neil Sloane President at The OEIS Foundation, Inc. Highland Park, NJ. , He transferred the intellectual property and hosting of the OEIS to the OEIS Foundation in 2009. A secret code had been inserted, that spelt out a number sequence. , OEIS records information on integer sequences of interest to both professional and amateur mathematicians, and is widely cited. Number of 3-dimensional polyominoes (or polycubes) with n cells and symmetry group of order exactly 24. It contains essentially prime numbers (red), numbers of the form an (green) and highly composite numbers (yellow). The OEIS Foundation, Inc, +3 more Main Address. , He published selections from the database in book form twice: These books were well received and, especially after the second publication, mathematicians supplied Sloane with a steady flow of new sequences. In this tribute to Neil Sloane, we revisit the first sequence in the On-Line Encyclopedia of Integer Sequences, sequence A435 (1, 8, 78, 944, 13800, 237432, 4708144, 105822432, ...), that he encountered when he was a graduate student, and when normalized gives the average total height of rooted labeled trees.

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