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

Neil Sloane njasloane at gmail.com
Thu May 4 16:41:20 CEST 2017

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 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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