Buy A Handbook of Integer Sequences on ✓ FREE SHIPPING on qualified orders. Cover for A Handbook of Integer Sequences N.J.A. Sloane If nothing is known about the history of the sequence or if it is an arbitrary sequence, nothing can. The On-Line Encyclopedia of Integer Sequences. Neil J. A. Sloane. Visiting Scholar, Rutgers University. President, OEIS Foundation. 11 South.

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She has the bed and ear-plugs for herself. But have you ever heard of the Kolakoski sequence?

On-Line Encyclopedia of Integer Sequences

The rule here is that the difference between each term is the number made by joining the digits either side of the comma between those respective terms. You can search for sequences by inputting numbers. Sloane has personally managed ‘his’ sequences for almost 40 years, but starting ina board of associate editors innteger volunteers has helped maintain the database.

Each sequence has its own page, which lists the early terms, and includes comments and references as well as other information. The OEIS maintains the lexicographical order of the sequences, so each sequence has a predecessor and a successor its “context”.

A handbook of integer sequences – Neil James Alexander Sloane – Google Books

Sequences of rationals are represented by two sequences named with the keyword ‘frac’: Number of 3-dimensional polyominoes or polycubes with n cells and symmetry group of order exactly The sequence only contains 1s and ssequences. Abinary expansions here 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, He was only interested in integer sequences, which are those made up of whole numbers and negative numbers and zero.


You extract sieve out all the appearances of the prime numbers in the decimal expansion of pi. In fact, one of the great strengths of the OEIS is that it unites professionals and amateurs. This line of thought leads to the question “Does sequence A intrger contain the number n?

A lists the first term given in sequence A nbut it needs to be updated from time to time because of changing opinions on offsets. Inthe user interface was overhauled and more advanced search capabilities were added. One prolific amateur is the Belgian journalist Eric Angelini, who is the author of the following sequence A submitted in July that Neil particularly likes:. With the added constraint that numbers are not repeated and you always take the lowest number possible.

This special usage has a solid mathematical basis in certain counting functions.

More of her art and cartoons here. Some people collect stamps, some collect fossils but Neil sloanne always collected sequences. OEIS records information on integer sequences of interest to both professional mathematicians and amateursand is widely cited.

The rule here is that you start with 0, and whenever you get to a number you have not seen before, the following term ingeger a 0. As a spin-off from the database work, Sloane founded the Journal of Integer Sequences in Sequences of weight distribution codes often omit periodically recurring zeros.


A Handbook of Integer Sequences. Loading comments… Trouble loading?

Marks from the year-old Ishango bone from the Congo. Topics Mathematics Science blog network.

The Kolakoski sequence is prestigious for another reason: Perhaps it is, but the OEIS sees to it that even the drivel of fools is harnessed industriously. An interesting fact about the commas sequence is that it carries on for an awfully long time.

There are 4 solutions for 4, but no solutions for 14, hence a 14 of A is 0—there are no solutions. Greek letters are usually represented by their full names, e.

Today I want to write about favourite sequences.

Neil Sloane: the man who loved only integer sequences

It also gives ineger the option to plot a graph of the sequence, or listen to it as a piece of music where each number is a note in a scale of eight octaves.

In other words, to be inventive in this medium, one must have mastery of only two things, numbers and ideas. This sequence spurred progress on finding more terms of A