2 things about the OEIS Welcome Page

Richard Mathar mathar at strw.leidenuniv.nl
Tue Jun 10 16:40:04 CEST 2008

so the script which creates the HTML page would have to scan the database
  This may not work with old OEIS entries because these are not carrying the
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Date: Tue, 10 Jun 2008 11:21:43 -0400
Subject: Re: 2 things about the OEIS Welcome Page
From: Jonathan Sondow <jsondow at alumni.princeton.edu>
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Date: Tue, 10 Jun 2008 09:59:48 -0700
From: "Jonathan Post" <jvospost3 at gmail.com>
To: "Sequence Fans" <seqfan at ext.jussieu.fr>
Subject: A005097 (Odd primes - 1)/2 implicitly referenced in new arXiv paper
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A005097 (Odd primes - 1)/2 is implicitly referenced in the new arXiv
paper, Theorem 2.1, p.5

    Title: On Hamilton Decompositions
    Authors: Dhananjay P. Mehendale
    Comments: 7 pages, a counter example provided by leading
tournament on 9 vertices is added
    Subjects: General Mathematics (math.GM)

This might be added as a hotlinked reference.  Or not.

What are the general guidelines for referencing a paper in the
hardcopy or online literature that uses an OEIS sequence but fails to
notice or cite that?


Jonathan Vos Post

njas> From seqfan-owner at ext.jussieu.fr  Wed Jun  4 19:40:46 2008
njas> Date: Wed, 4 Jun 2008 13:39:36 -0400
njas> From: "N. J. A. Sloane" <njas at research.att.com>
njas> To: njas at research.att.com, seqfan at ext.jussieu.fr
njas> Subject: 2 things about the OEIS Welcome Page
njas> ....
njas> What I tried was this: I went to a sequence, say A000010.
njas> Then I clicked Bookmarks (in Firefox), but the "Subscribe to This Page"
njas> line was not activated (it was shadowy)

1) Some investigation on the Firefox implementation shows that it allows
not provided by the http://www.research/../sequences/Axxxxx web pages. This
explains why one cannot activate subscription from that bookmark panel. The
mechanism seems to be fairly different from the one described for the IE
in earlier seqfan postings, which seems to be based on a caching+polling
procedure by the IE browser.

2) To implement such a RSS service, one would have to add in the <header>
of the Axxxxxx HTML pages a "feed" link that could be grabbed by the
browser, a format like

<link rel="alternate" type="application/rss+xml" title="RSS OEIS A000010"

and add for each of the sequences the corresponding XML file (of roughly 20 lines)
with the RSS 2.0 content, here for example a file
http://www.research.att.com/~njas/sequences/A000010.xml .

This can be made more explicit (=clickable) by adding a link in the web page with
that characteristic RSS feed symbol.

The most important content of each XML file would be a link back to the original web page
plus the <pubDate>...</pubDate> tags in the <item></item>  within the <channel> as
generated from the available information when the contents of the database actually
changed, because these parts of the scheme tell the subscriber's software
whether it ought trigger. See http://en.wikipedia.org/wiki/RSS_(file_format) .

Again, whoever wrote the software to compose the current sequences/Axxxxx pages
could as well let it create the Axxxx.xml pages at the same time. The "annoying" part
from a programmer's point of view is (see my previous posting) to scan the database
for its "last changed" date to extract the date/time .

3) Is such a feature valuable? The OEIS is a database
of numbers; these have been created by God (or someone else) with no intend
to be changed rapidly. In the best of all worlds, each sequence is created
perfectly (all members of the sequence correct, all dependent sequences
x-referenced, all formulas correct, definition precise and still human-readable),
and never needs correction. So the OEIS is quite the opposite of a news or radio
channel where "high" value might be measured proportional to the frequency of
change. The quality of the database contents is in that sense negatively
correlated with the value of any monitoring mechanism/capability: the more static
an entry, the better. (This last remark does not apply to the sequences in the
"less,obsc" category which are left untouched just because actually nobody
ever looks at them...)


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