[seqfan] Re: A new sequence?

Neil Sloane njasloane at gmail.com
Wed Feb 5 16:27:48 CET 2014


It should probably start with 2:

2, 31, 19, 23, 139, 6089, 40949, 13153513, 748105003, 11307204673,
202073177599

and have offset 0. To avoid the usual ambiguity in English of the
word "repeated", the definition might be:

Smallest prime such that if n copies of the final digit are adjoined to the
number, it remains prime.

Could you submit it?

Thanks!

Neil


On Wed, Feb 5, 2014 at 8:58 AM, Claudio Meller <claudiomeller at gmail.com>wrote:

> I saw this sequence in
> https://groups.yahoo.com/neo/groups/primenumbers/conversations/topics/25454
>
> a[n] is the smallest prime that remains prime for precisely n times when
> its final decimal digit is repeated.
>
> 31, 19, 23, 139, 6089, 40949, 13153513, 748105003, 11307204673,
> 202073177599
>
>
>
> --
> Claudio Meller
> http://grageasdefarmacia.blogspot.com
> http://todoanagramas.blogspot.com/
> http://simplementenumeros.blogspot.com/
>
> _______________________________________________
>
> Seqfan Mailing list - http://list.seqfan.eu/
>



-- 
Dear Friends, I have now retired from AT&T. New coordinates:

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


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