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

[Juan Arias de Reyna]

I do not know the web site. I was looking for information about 
the "happy end problem" of Erdös-Szekeres and found some information
there. I browse a little and found this claim. I doubt a proof 
of this may be easy. After all the prime numbers as 319993 exist.

Perhaps somebody can make a search to try if there is  some experimental
evidence.  

Juan


> On 4/5/2017, at 16:41, 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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