%I A155724
%S A155724 0,3,8,6,13,20,9,18,27,36,12,23,34,45,56,15,28,41,54,67,80,18,33,48,63,
%T A155724 78,93,108,21,38,55,72,89,106,123,140,24,43,62,81,100,119,138,157,176,
%U A155724 27,48,69,90,111,132,153,174,195,216
%N A155724 Triangle read by rows where T(m,n)=2mn+m+n-4
%C A155724 Numbers n such that 2n+9 is not prime
%e A155724 Triangle begins: 0; 3, 8; 6, 13, 20; 9, 18, 27, 36; 12, 23, 34, 45, 56; 
               15, 28, 41, 54, 67, 80; 18, 33, 48, 63, 78, 93, 108; 21, 38, 55, 
               72, 89, 106, 123, 140; 24, 43, 62, 81, 100, 119, 138, 157, 176; 27, 
               48, 69, 90, 111, 132, 153, 174, 195, 216;
%Y A155724 Cf. A155723, A155722
%Y A155724 Sequence in context: A083700 A021725 A080939 this_sequence A098737 A164654 
               A072396
%Y A155724 Adjacent sequences: A155721 A155722 A155723 this_sequence A155725 A155726 
               A155727
%K A155724 nonn,tabl
%O A155724 1,2
%A A155724 Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 25 2009