%I #10 Sep 08 2022 08:45:40
%S -2,1,6,4,11,18,7,16,25,34,10,21,32,43,54,13,26,39,52,65,78,16,31,46,
%T 61,76,91,106,19,36,53,70,87,104,121,138,22,41,60,79,98,117,136,155,
%U 174,25,46,67,88,109,130,151,172,193,214,28,51,74,97,120,143,166,189,212
%N Triangle read by rows where T(m,n)=2*m*n + m + n - 6.
%C Numbers n such that 2n+13 is not prime.
%C First column: A016777, second column: A016861, third column: A017029, fourth column: A017245. - _Vincenzo Librandi_, Nov 21 2012
%H Vincenzo Librandi, <a href="/A155550/b155550.txt">Rows n = 1..100, flattened</a>
%e Triangle begins:
%e -2;
%e 1, 6;
%e 4, 11, 18;
%e 7, 16, 25, 34;
%e 10, 21, 32, 43, 54;
%e 13, 26, 39, 52, 65, 78;
%e 16, 31, 46, 61, 76, 91, 106;
%e 19, 36, 53, 70, 87, 104, 121, 138;
%e 22, 41, 60, 79, 98, 117, 136, 155, 174;
%e 25, 46, 67, 88, 109, 130, 151, 172, 193, 214; etc.
%t t[n_,k_]:= 2 n*k + n + k - 6; Table[t[n, k], {n, 15}, {k, n}]//Flatten (* _Vincenzo Librandi_, Nov 21 2012 *)
%o (Magma) [2*n*k + n + k - 6: k in [1..n], n in [1..11]]; // _Vincenzo Librandi_, Nov 21 2012
%Y Cf. A153082, A016777, A016861, A017029, A017245.
%K tabl,sign
%O 1,1
%A _Vincenzo Librandi_, Jan 24 2009