[seqfan] Re: a(n) = number of terms of n-th finite OEIS sequence
Neil Sloane
njasloane at gmail.com
Mon Dec 12 00:53:20 CET 2016
> 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 Fröhlich 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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