[seqfan] Re: Sequences of real numbers

Pontus von Brömssen pontus.von.bromssen at gmail.com
Wed Dec 27 21:38:16 CET 2023

Maximilian, thanks for the input (and for correcting A073027).

I agree it would be difficult to search directly for the table, but I
imagine it could be facilitated by submitting both the table and the
first few rows separately. Searching for one of the rows would then lead to
the table via a cross-reference.


On Wed, Dec 27, 2023 at 5:46 PM M. F. Hasler via SeqFan <
seqfan at list.seqfan.eu> wrote:

> I think we can get a good idea of how useful (i.e., useless) such a table
> is,
> from the fact that nobody, not even the authors, ever looked at that table
> (row n = digits of sqrt(n)), since it was added over 20 years ago.
> and this is certainly one of the most natural, simplest and least contrived
> tables of that kind of table one can imagine.
> It is nearly impossible to search for one of the subsequences of such a
> table. (Many years ago I have created a form that allows to search for such
> tables/matrices/ triangles, but I think it's no more available due to the
> reformed web site of our university... And anyways, unless OEIS would
> provide a prominently visible link to such a form on each search page, it
> is of not much help for the average reader.
> So I would strongly suggest to submit the constants (if they are of general
> interest) as individual 'cons' sequences.
> - Maximilian
> On Wed, Dec 27, 2023, 11:24 Pontus von Brömssen <
> pontus.von.bromssen at gmail.com> wrote:
> > Hi all,
> >
> > I have a couple of sequences of real numbers that I plan to submit to the
> > OEIS as tables of decimal expansions, i.e., sequences with the two
> keywords
> > "cons" and "tabl", like A073027. However, searching for sequences with
> > those two keywords results in only two hits: A000012 (the all 1's
> sequence)
> > and A073027 (decimal expansions of sqrt(n) for n >= 1). Does this imply
> > that that kind of sequences are discouraged? Or should "cons" not be used
> > for such tables? Is there a better format that conways the same
> > information? (By the way, there are errors in the data for A073027,
> easily
> > spotted by following the "table" link https://oeis.org/A073027/table.)
> >
> > For the curious, the sequences I plan to submit are counterparts to
> > A368386-A368395 for external (as opposed to internal) diffusion-limited
> > aggregation on the square lattice. For internal DLA, the numbers are
> > rational, but for external DLA, they lie in the field Q(pi), i.e., they
> are
> > rational expressions of pi with integer coefficients. For example, the
> > probability that the first three cells are collinear is 1/3 for internal
> > DLA and (4-pi)/(24-7*pi) for external DLA.
> >
> > An alternative to decimal expansions is to give the coefficients in the
> > rational expressions of pi, but I find that a bit awkward because of the
> > irregular behaviour of the degrees of the rational expressions.
> >
> > Cheers,
> >
> > Pontus
> >
> > --
> > Seqfan Mailing list - http://list.seqfan.eu/
> >
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