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Questions tagged [oeis]

For questions related to the On-Line Encyclopedia of Integer Sequences.

The On-Line Encyclopedia of Integer Sequences, also called OEIS, is an online database of integer sequences, founded in 1964 by N.J.A. Sloane, and maintained by the OEIS Foundation.

It currently (August 2022) contains over 356,000 integer sequences.

195 questions
6
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On a certain OEIS convention

Do you know what it is that those numbers which appear in the upper-right angle of the blue-box mean? I presume they have to do with a certain ranking of the sequences within the site, but I am not sure. Thanks in advance for your replies.
Jamai-Con
  • 577
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Polynomials $P(x,y)$ with nonnegative integer coefficients such that $P(x,y) \equiv 1 \text{ (mod } x+y-1)$ and $P(1,1) = n$.

In 1971 Richard Guy sent a letter to Neil Sloane outlining some integer sequences. One of these sequences, A279196, was added to the OEIS by Neil only in December of 2016: A279196: Number of polynomials $P(x,y)$ with nonnegative integer…
Peter Kagey
  • 5,052
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Where can I find the number of occurrences of every integer $n$ in the Sloane encyclopedia of integer sequence (OEIS)?

I've just read this interesting article: http://arxiv.org/pdf/1101.4470.pdf Where I found this graph representing $N(n)$ the number of occurrences of every integer $n$ in the Sloane encyclopedia of integer sequence (OEIS): I would like the list of…
Omega Force
  • 832
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Understanding formula for OEIS A334742: a(A033638(n)) = a(A002620(n))

How do I interpret the formula for OEIS A334742 (https://oeis.org/A334742), which is given as: $$a(A033638(n)) = a(A002620(n)) \,\,\mathrm{for}\,\, n > 1.$$ Since $$A002620(n)= \Bigl\lfloor\frac{n^2}{4}\Bigr\rfloor$$ and $$A033638(n) = A002620(n)+1…
theorist
  • 363