[seqfan] Re: a(n) = number of terms of n-th finite OEIS sequence
Felix FrÃ¶hlich
felix.froe at gmail.com
Mon Dec 12 14:29:49 CET 2016
Okay, I already suspected this may not really be a good sequence idea.
Thanks for the replies.
Regards
Felix
2016-12-12 0:53 GMT+01:00 Neil Sloane <njasloane at gmail.com>:
> > Number of terms of n-th finite integer sequence in the OEIS.
>
> This is even more problematic than the other sequences that
> involve A-numbers. For many reasons.
>
> One reason: there are a large number of sequences whose status is presently
> unknown. The assignment of the keyword "fini" to these sequences in the
> OEIS has always been non-rigorous, depending on whether it seemed likely or
> unlikely
> for the sequence to be finite. It would be most unwise to base a sequence
> on
> the presence of that keyword.
>
> Best regards
> Neil
>
> Neil J. A. Sloane, President, OEIS Foundation.
> 11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
> Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
> Phone: 732 828 6098; home page: http://NeilSloane.com
> Email: njasloane at gmail.com
>
>
> On Sun, Dec 11, 2016 at 6:08 PM, <israel at math.ubc.ca> wrote:
>
> > In a search for keyword fini, the first three results (sorted by number)
> > are A000053, A000054 and A000797. The first two are OK (at least until
> New
> > York changes the IRT #1 and A line subway stops), but finiteness of
> A000797
> > is an open problem.
> >
> > Cheers,
> > Robert
> >
> >
> > On Dec 11 2016, Felix FrÃ¶hlich wrote:
> >
> > Dear Sequence fans
> >>
> >> The OEIS already contains several sequences counting something in n-th
> >> OEIS
> >> sequence or giving A-numbers of sequences with a specific property. I
> >> found
> >> the following sequences of this type: A039928, A053169, A051070,
> A053873,
> >> A091967, A107357, A102288, A100543, A100544, A111198, A111157, A250219,
> >> A250221.
> >>
> >> So here is another idea for such a sequence:
> >>
> >> Number of terms of n-th finite integer sequence in the OEIS.
> >>
> >> Several questions: Would that sequence be acceptable? Are there enough
> >> initial known terms so that the sequence can be added?
> >>
> >> Best regards
> >> Felix
> >>
> >> --
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> >>
> >>
> >>
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> >
>
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