2 things about the OEIS Welcome Page

Brendan McKay bdm at cs.anu.edu.au
Thu Jun 5 11:19:31 CEST 2008

The reason that "subscribe" and similar features do not work is that
the ATT server does not include the Last-Modified: header in serving
OEIS pages. This is not the case for all pages on that server,
so maybe there is some way to do it. The best chance would be an
ordinary URL (without the "?q..." stuff) for the raw text version of the sequence. Is there one?

Btw, since wget is mentioned I'll mention that "wget -S URL" is one
way to see the HTTP headers.


* Joerg Arndt <arndt at jjj.de> [080605 18:24]:
> A script that does a wget (of the internal format as text),
> and diffs with the last version would also do the job.
> E.g. see
> http://www.research.att.com/~njas/sequences/?q=id%3aA111111&p=1&n=10&fmt=3
> Only the first few and the last line would have to be discarded.
> Like this:
> wget URL | grep -A999 '^%I' | grep -B999 '^%A' > bla
> diff bla bla-old && some-alert-func
> People "subscribing" this way will create a load by
> page polling.  However, when a poll is done reasonably rare
> (e.g. once a day) there should be no problem.
> * Jonathan Sondow <jsondow at alumni.princeton.edu> [Jun 05. 2008 17:43]:
> > Neil,
> > 
> > Re subscribing to an OEIS entry:
> > 
> > I followed Maximilian's suggestion and used IE to subscribe to the text
> > format of an OEIS entry. But I was often notified that the page had changed
> > when only the time to create the page had changed. So I stopped subscribing.
> > 
> > Best,
> > Jonathan
> > 
> > [...]

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