[seqfan] Re: Additional keywords for OEIS

[Frank Adams-Watters]

While I'm not familiar with the code being used, making new keywords 
available can't be very difficult.

Getting the keyword assigned to all and only those sequences where it 
belongs is another matter, ranging from a bit trickier than you might 
think to requiring many man-hours. For the example below, the process 
could be automated with 99%+ accuracy. I don't know of any off hand, 
but there are probably sequences in the database whose first non-prime 
member comes quite late. The process also has to be able to deal with 
sequences having very large terms. One keyword I have considered, 
"fact", for those sequences which depend on factorization, in the same 
way that "base" sequences depend on representation as numerals, would 
be very difficult to get anywhere close to being right.

Franklin T. Adams-Watters

-----Original Message-----
From: Felix Fröhlich <felix.froe at googlemail.com>
To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
Sent: Fri, Feb 20, 2015 5:10 am
Subject: [seqfan] Additional keywords for OEIS


Dear SeqFans,

as some of you might know, there has been some discussion about the
addition of additional keywords to the OEIS. Most of what I found 
regarding
that discussion has taken place in the userspace of Charles Greathouse 
in
the OEIS Wiki. See
https://oeis.org/wiki/User_talk:Charles_R_Greathouse_IV/Keywords and
https://oeis.org/wiki/User:Charles_R_Greathouse_IV/Keywords/Table and 
the
corresponding talk pages.

Personally I think the possibility to refine OEIS searches via specific
keywords is very useful and I often make use of that feature. The 
addition
of new keywords would allow one to get even more relevant results. For
example, Alex Ratushnyak in 2013 suggested the addition of a keyword 
'prim'
that would allow one to find all sequences where all terms are prime. 
Two
obvious candidates for this keyword would be sequences like A000040
or A000043.

As I am not familiar with the technical aspects behind the OEIS 
database, I
would like to know how much work it would be to add new keywords to the
OEIS or whether it is technically possible at all (maybe it's just like
running an SQL query to update some database table, or maybe it requires
some complete rewrite of some part of the software underlying the OEIS, 
I
do not know). If it is technically feasible to do this and if those who
maintain the technical integrity of the OEIS think such a step would be
desirable, then as a next step we could collect suggestions regarding 
which
keywords would be useful.

What do others think?

Best regards

Felix Fröhlich

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