[seqfan] Re: easy and bref

Charles Greathouse charles.greathouse at case.edu
Fri Sep 30 02:32:34 CEST 2011

I encourage people to remove the "easy" keyword from sequences that
don't deserve it (and to add it to those that need it, of course).  If
you can't even make a thousand-term b-file it's probably not easy
(unless the terms are just too big to fit).

Charles Greathouse
Case Western Reserve University

On Thu, Sep 29, 2011 at 7:38 PM, Joseph S. Myers <jsm at polyomino.org.uk> wrote:
> On Mon, 26 Sep 2011, Nathaniel Johnston wrote:
>> Dear SeqFans,
>> Another keyword combination that is quite ugly to my eye is "easy" and
>> "more". I've cleaned up quite a few of these by adding more terms, but there
>> are still 291 remaining. Most of these sequences still contain both keywords
>> for one of two reasons: either the sequence is difficult to understand
>> and/or needs editing by someone with expertise in the area (such as
>> A002875), or it is "easy" to construct small terms by hand but writing a
>> program to compute terms seems to be a nontrivial task (such as A072149).
> I've submitted extensions and b-files for A072149-A072151 - they aren't
> that hard to program; A072152-A072154 to follow later.  I haven't tried to
> determine their generating functions, though they will certainly have
> rational generating functions.
> There are 238 easy+more sequences left - I think most are probably
> genuinely easy once you've understood them (which is the nontrivial part
> in many cases).  Some look "easy" to add a few more terms to but not to
> extend to the full three rows let alone to 1000 terms in a b-file
> (A092645, for example).  It might be interesting to see what "easy"
> sequences there are that are significantly short of the normal three rows
> of numbers but aren't marked "more" (more generally, if a sequence is well
> short of three rows of numbers but isn't "full", it's a candidate for
> "more" unless it's known the next number would take it over three rows).
> --
> Joseph S. Myers
> jsm at polyomino.org.uk
> _______________________________________________
> Seqfan Mailing list - http://list.seqfan.eu/

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