[seqfan] Re: Sums of each ten terms of A033308

[Jeremy Gardiner]

Why groups of 10? What happens with other partitions?

On 9/1/10 07:53, "zak seidov" <zakseidov at yahoo.com> wrote:

> Take A033308 Decimal expansion of Copeland-Erdos constant:concatenate primes:
> 
> 2,3,5,7,1,1,1,3,1,7,1,9,2,3,2,9,3,1,3,7,4,1,4,3,4,7,5,3,5,9,6,1,6,7,7,1,7,3,7,
> 9,8,3,8,9,9,7,1,0,1,...
> 
> Partition it in groups of 10 and write down sums of each group:
> p10 = 31,40,45,54,47,23,29,35,44,41,51,24,38,35,51,38,26,38,53,...
> Graph of p10 shows some misterious (quasi-)periodicity of length about 50:
>  Is it real? Any explanation?
>