[seqfan] Re: Related to Collatz

Melvin M Peralta melvinmperalta at gmail.com
Tue Feb 16 17:38:21 CET 2016


Does anyone have a resource they can point me to for generating a b-file
from a list in Mathematica? I'm still very much new to this.

Also, if you change the sequence so a(n + 1) = ceiling[sqrt(a(n))], you
still don't get a permutation. In that case, a(1972)=a(2208)=6667


On Tue, Feb 16, 2016 at 11:16 AM, Neil Sloane <njasloane at gmail.com> wrote:

> It's now A268962
>
> Still interesting even if not a perm
>
> Could use a b-file, say 10K or 20K terms
>
> Graph looks like it will be interesting too
>
> Best regards
> Neil
>
> 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 Tue, Feb 16, 2016 at 10:32 AM, Hans Havermann <gladhobo at teksavvy.com>
> wrote:
>
> > > a(1) = 1, a(2) = 2
> > > a(n + 1) = floor[sqrt(a(n))], if not already in the sequence
> > > otherwise, a(n + 1) = a(n) + a(n - 1)
> > ...
> > > The biggest question is if it's an integer permutation.
> >
> > a(1274) = 39, a(1275) = 1627; floor(sqrt(1627)) = 40 = a(709), already in
> > the sequence, so a(1276) = 39 + 1627 = 1666. But a(708) = 1666 also, so
> the
> > sequence will not be an integer permutation.
> >
> > _______________________________________________
> >
> > Seqfan Mailing list - http://list.seqfan.eu/
> >
>
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>
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>



-- 
Melvin M. Peralta
440.391.0073



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