[seqfan] Re: Forcing of exact searches?

[Neil Sloane]

The OEIS used to be on punched cards, and Russ has always made it
possible for me (and a couple of other people) to download a copy of the
current OEIS
in punched-card format.   This is a flat ascii file. The file is called
cat25 (that name has not changed for 25 years, although the file has grown).

The current version (it is now a few weeks out of date) is:
 $ wc cat25
 5936314 53306288 408589671 cat25

That means it contains 5936314 (virtual) punched cards.  It is what you see
if the click on "internal format" for a sequence.

It is nice to have this file, because I can grep in it for any string I
want to see.
I can do an exact search for any string.
The one annoying thing is that names with accents (like Erd****s) have
been distorted in the file, so it is hard to grep for them. (That is why I
always try to
give both the nonascii name (Erd****s) and the ascii name (Erdos) in
sequence entries.)

Of course, if you don't have a unix system, you are out of luck!




On Fri, Aug 9, 2019 at 12:15 AM Peter Munn <techsubs at pearceneptune.co.uk>
wrote:

> I don't know how easy it would be to provide, but I offer this other
> example of when a "raw" search option would be useful. There are 70 to 80
> sequences that consist only of "1"s and "-1"s and I know no way to make
> the search distinguish the two values, making it more difficult to find
> such a sequence, and even more awkward to be sure such a sequence is
> absent.
>
> Best Regards,
> Peter
>
> On Thu, August 8, 2019 9:28 pm, Giovanni Resta wrote:
> > I did encounter the same problem many times and I tried a few variations
> > but it seems there is not an "exact" search.
> >
> > For example, I was looking  for powerful (A001694) numbers but since
> > "powerful" is translated to "power" I got thousands of results: I had to
> > enter a search like 4, 8, 9, 16, 25, 27, 32, 36, 49, 64, 72 to find the
> > actual sequence.
> >
> > A simple search of a fixed string would be very useful.
> >
> > Il 07/08/2019 09:57, Hugo Pfoertner ha scritto:
> >> SeqFans,
> >>
> >> is there a method to force "exact" searches for words?
> >> A search
> >>
> https://oeis.org/search?q=%22factorization%22+keyword%3Ahard&sort=&language=&go=Search
> >> produces 922 hits, because the occurrence of "factor" also produces a -
> >> in
> >> my case unwanted - match.
> >> I can not see that the search hints https://oeis.org/hints.html deal
> >> with
> >> this problem.
> >>
> >> Hugo
> >>
> >> --
> >> Seqfan Mailing list - http://list.seqfan.eu/
> >
> > --
> > Seqfan Mailing list - http://list.seqfan.eu/
> >
>
>
>
> --
> Seqfan Mailing list - http://list.seqfan.eu/
>