%I A139597
%S A139597 0,7,15,30,46,69,93,124,156,195,235,282,330,385,441,504,568,639,711,790,
%T A139597 870,957,1045,1140,1236,1339,1443,1554,1666,1785,1905,2032,2160,2295,
%U A139597 2431,2574,2718,2869,3021,3180,3340,3507,3675,3850
%N A139597 A139278(n) followed by A139274(n+1).
%C A139597 Sequence found by reading the line from 0, in the direction 0, 7,... 
               and the line from 15, in the direction 15, 46,..., in the square 
               spiral whose vertices are the triangular numbers A000217.
%H A139597 O. E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica 
               de los numeros primos y perfectos</a>.
%F A139597 Array read by rows: row n gives 8*n^2 + 7n, 8*(n+1)^2 - (n+1).
%e A139597 Array begins:
%e A139597 0, 7
%e A139597 15, 30
%e A139597 46, 69
%e A139597 93, 124
%Y A139597 Cf. A000217, A046092, A139274, A139278, A077221, A139591, A139592, A139593, 
               A139595, A139596, A139598.
%Y A139597 Sequence in context: A063611 A146624 A006188 this_sequence A117747 A137196 
               A120094
%Y A139597 Adjacent sequences: A139594 A139595 A139596 this_sequence A139598 A139599 
               A139600
%K A139597 easy,nonn
%O A139597 0,2
%A A139597 Omar E. Pol (info(AT)polprimos.com), May 03 2008