[seqfan] Re: A new sequence?
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,
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?
On Wed, Feb 5, 2014 at 8:58 AM, Claudio Meller <claudiomeller at gmail.com>wrote:
> I saw this sequence in
> 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,
> Claudio Meller
> 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
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