[seqfan] Re: Primes by concatenation

[Neil Sloane]

Nice! I added A228323, A228234. They need more terms.
Neil


On Wed, Aug 14, 2013 at 1:01 PM, Eric Angelini <Eric.Angelini at kntv.be>wrote:

>
>
> Hello SeqFans,
> if I'm not wrong, S is not in the OEIS:
> -- S starts with a(1)=1 then S is extended with the smallest integer a(n)
> not yet present in S such that the
> concatenation < a(n-1); a(n) > or < a(n); a(n-1) >
> is prime.
>
> S=1,3,2,9,5,21,4,7,6,13,10,19,16,27,8,11,15,23,12,17,20,29,32,59,14,...
>
> Primes produced by said concatenation  are:
> 13,23,29,59,521,421,47,67,613,1013,1019,1619,1627,827,811,1511,...
>
> I guess S is a permutation of N (1,2,3,4,5,... oo)
> Best,
> É.
>
>
>
>
>
>
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>



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