A154618 Triangle read by rows: integer values of T(n,m) = (4*m*n+2*m+2*n-3)/3.

7, 15, 17, 39, 29, 55, 27, 61, 95, 43, 81, 119, 37, 83, 129, 175, 57, 107, 157, 207, 47, 105, 163, 221, 279, 71, 133, 195, 257, 319, 57, 127, 197, 267, 337, 407, 85, 159, 233, 307, 381, 455, 67, 149, 231, 313, 395, 477, 559, 99, 185, 271, 357, 443, 529, 615, 77

Offset

1,1

Links

Table of n, a(n) for n=1..57.

Example

The sequence contains the integers selected from the full table:
5/3;
11/3,7;
17/3,31/3,15;
23/3,41/3,59/3,77/3;
29/3,17,73/3,95/3,39;
35/3,61/3,29,113/3,139/3,55;
41/3,71/3,101/3,131/3,161/3,191/3,221/3;
47/3,27,115/3,149/3,61,217/3,251/3,95;

Mathematica

Select[Flatten[Table[(4*m*n+2*m+2*n-3)/3, {m, 30}, {n, m}]], IntegerQ] (* Harvey P. Dale, Jun 10 2015 *)

Crossrefs

Cf. A034936, A154616

Sequence in context: A216848 A065566 A329485 * A275190 A224891 A138641

Adjacent sequences: A154615 A154616 A154617 * A154619 A154620 A154621

Keyword

nonn,tabf

Author

Vincenzo Librandi, Jan 16 2009

Extensions

Keyword:tabl removed, appearance of fractions clarified by R. J. Mathar, Oct 16 2009

Status

approved