[seqfan] Re: Discrepancy between definition and terms in A257481?
kival at psp.co.th
Wed May 20 02:53:14 CEST 2015
Dear Neil & Seq fan,
I added illustrations into A257481 & A257594.
From: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Neil Sloane
Sent: Tuesday, May 19, 2015 2:42 AM
To: Sequence Fanatics Discussion list
Subject: [seqfan] Re: Discrepancy between definition and terms in A257481?
Felix (I am in London with only limited access to email)
I agree there is something very wrong with A257481.
The original definition was unclear to me, so I made a guess, which was obviously wrong.
I will replace the definition with a new guess, and assign the present defintion, which seems to give the values
0,0,0,0,0,0,1,1,2,3,4,5,7 (for n >= 0) to a new sequence A257954
Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com
On Mon, May 18, 2015 at 4:27 PM, Brad Klee <bradklee at gmail.com> wrote:
> Hi Felix,
> The sequence is cross-referenced with A182619.
> "Number of vertices that are connected to two edges in a spiral
> without holes constructed with n hexagons."
> It could be that the "chain" is a linear object. For n=12 the chain
> would spiral around to enclose 3 of its "links" with the other 9 circles.
> I agree it is confusing, and could maybe use an illustration.
> On Mon, May 18, 2015 at 3:20 AM, Felix Fröhlich
> <felix.froe at googlemail.com
> > Dear SeqFans
> > the definition says "a(n) is the maximal number of circles that can
> > be enclosed by a chain of n circles". So why does the example say
> > "For a(7), one circle can be completely enclosed by six surrounding
> > circles"? Isn't that an example for the value of a(6)? Same goes for
> > the example for
> > Shouldn't a(10), by the definition of the sequence, give the maximum
> > of circles that can be surrounded by a chain of ten circles? Or am I
> > completely misunderstanding something about the sequence? Can
> > someone clarify how the definition, example and terms of the
> > sequence correlate
> > each other?
> > Best regards
> > Felix Fröhlich
> > _______________________________________________
> > Seqfan Mailing list - http://list.seqfan.eu/
> Seqfan Mailing list - http://list.seqfan.eu/
Seqfan Mailing list - http://list.seqfan.eu/
More information about the SeqFan