[seqfan] Re: Iterating some number-theoretic functions

Hugo Pfoertner yae9911 at gmail.com
Mon Sep 4 02:07:55 CEST 2017


All terms in my revised update of https://oeis.org/draft/A291790 are
surviving 200 trajectory steps.

On Mon, Sep 4, 2017 at 1:48 AM, Neil Sloane <njasloane at gmail.com> wrote:

> There were errors in my last message.  Hang on while I redo it.
>
> 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
> > The first trajectory that appears to be integral and unbounded is that of
> > 270, see A291789. Perhaps if that were understood it would help
> > prove that all the terms of A291790 are correct (just as the trajectory
> of
> > 45, A291787, for one of the other problems, has the recurrence
> a(n)=2*a(n-8)
> > and is therefore unbounded)
>


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