[seqfan] Re: Subset

Charles Greathouse charles.greathouse at case.edu
Fri Nov 22 15:37:43 CET 2013

The keyword subseq: already exists and does something like what you want.


Charles Greathouse
Case Western Reserve University

On Fri, Nov 22, 2013 at 6:59 AM, John W. Nicholson
<reddwarf2956 at yahoo.com>wrote:

> I would like to see a search keyword called "subset:" which allows you to
> search an A-sequence for any other A-sequence subset. For example,
> "subset:A002386" would result in A205827, A111870, A182514, and other
> A-sequences which are subsets to A002386. It would not only use the
> A-sequence "list" values, but also b-file sequence values during a search.
> The reason I ask of this happening is because of the need to see if any of
> the subsets can be extended using the values of the set. With the examples
> above we can see that if A205827 is extended with A002386 values and
> related values, like A000101=Nextprime(A002386), A005669 = pi(A002386), we
> can see A111870 and A182514 can be extended also in the same manner but use
> A002386 as the superset.
> I realize that some sets (natural numbers) will not work well for this and
> an error can be used as to shorten the search with those as to say "Sorry,
> you are asking to for much. Please pick a smaller subset" . Even using
> A000040 may be to much, so maybe make it "primesubset:"
> John W. Nicholson
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