[seqfan] Re: A068652 Numbers such that every cyclic permutation is a prime.

Alexei Kourbatov akourbatov at gmail.com
Thu May 4 16:55:16 CEST 2017


The claim is obviously false, at least four larger terms appear after
319993.
They are, not surprisingly, 331999, 933199, 993319, 999331.

On Thu, May 4, 2017 at 7:41 AM, Neil Sloane <njasloane at gmail.com> wrote:

> Juan,  Thanks for that message.  I will add a link from A068652
> reporting the claim.
>
> Do you know this web site?  Should we believe the claim?  Could we
> perhaps ask the author if
> he has a proof?
>
> The fact that there is a flashy blinking thing on the page makes
> me doubt that it is serious.
>
>
> 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 Thu, May 4, 2017 at 7:17 AM, Juan Arias de Reyna <arias at us.es> wrote:
> >
> > In the web page
> >
> > http://tangente-mag.com/maths_etonnantes.php?id=3139 <
> http://tangente-mag.com/maths_etonnantes.php?id=3139>
> >
> > says that after the last number showed 319993 the only remaining terms
> > are the repunits  primes.
> >
> > Is this true?  Perhaps a comment to A068652 with this observation
> > should be added?
> >
> > Juan
> >
> >
> >
> > --
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>
> --
> Seqfan Mailing list - http://list.seqfan.eu/
>



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