[seqfan] Re: Two branches in scatter graph of A102605

Neil Sloane njasloane at gmail.com
Fri Oct 27 03:58:23 CEST 2017


Zak,  That is a very interesting question

To see the graph, the URL should be https://oeis.org/A102605/graph.

One thing we might try is to define two new sequences, A; n such that
a(n) is on the lower branch;   B, n such that a(n) is on the upper branch

Here is a piece of the b-file:
...
123 125
124 91
125 135
126 128
127 89
128 143
129 127
130 94
131 146
132 127
133 102
134 147
135 141
136 105


so A contains ..., 124, 127, 130, 133, 136, ...

and B contains ..., 123, 125, 126, 128, 129, 131, 132(?), 134, ...


One could then work backwards to get the beginning of the two
sequence, and forwards to get more terms,

and we might get at the least 2 new sequences. Or they might be
sequences that are in the OEIS!




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, Oct 26, 2017 at 6:51 PM, zak seidov via SeqFan <
seqfan at list.seqfan.eu> wrote:

> Any explanation of two "branches in" scatter graph of A102605?
>  https://oeis.org/A102605/graphA102605 Number of ways of writing 2n+1 as
> p+q+r where p,q,r are primes with p < q < r.Thx,Zak
>
>
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> Seqfan Mailing list - http://list.seqfan.eu/
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