[seqfan] Re: a(n)+a(n+1) = concatenation of n and (n+1)

Neil Sloane njasloane at gmail.com
Sun Aug 5 01:07:09 CEST 2012


Nice! See A215077.

On Sat, Aug 4, 2012 at 5:30 PM, Eric Angelini <Eric.Angelini at kntv.be> wrote:

>
>
> >
> > Hello SeqFans,
> > start with a(1) = 1 then :
> > n = 1....2....3....4....5....6....7....8....9....10...11...12...13...14
> > S =
> > 1,11,12,22,23,33,34,44,45,865,...
> >
> > Ex:
> > 1+11=12 which is 1 conc. 2
> > 11+12=23 which is 2 conc. 3
> > 12+22=34 which is 3 conc. 4
> > 22+23=45 which is 4 con. 5
> > etc.
> > The leftmost column is S.
> > Best,
> > É.
> >
> >
>
> _______________________________________________
>
> Seqfan Mailing list - http://list.seqfan.eu/
>



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Neil J. A. Sloane, President, OEIS Foundation
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