A154685 Triangle read by rows where T(m,n)=2mn+m+n+4

8, 11, 16, 14, 21, 28, 17, 26, 35, 44, 20, 31, 42, 53, 64, 23, 36, 49, 62, 75, 88, 26, 41, 56, 71, 86, 101, 116, 29, 46, 63, 80, 97, 114, 131, 148, 32, 51, 70, 89, 108, 127, 146, 165, 184, 35, 56, 77, 98, 119, 140, 161, 182, 203, 224

Offset

1,1

Comments

The terms form a subset of A153039 because 2*T(m,n)-7=(2n+1)(2m+1) are not prime.

Links

Vincenzo Librandi, Rows n = 1..100, flattened

Formula

T(m,n) = A155724 + 8. - L. Edson Jeffery, Oct 12 2012

Example

Triangle begins:
8;
11, 16;
14, 21, 28;
17, 26, 35, 44;
20, 31, 42, 53, 64;
23, 36, 49, 62, 75, 88;
26, 41, 56, 71, 86, 101, 116;
29, 46, 63, 80, 97, 114, 131, 148;
32, 51, 70, 89, 108, 127, 146, 165, 184;
35, 56, 77, 98, 119, 140, 161, 182, 203, 224;

Mathematica

Flatten@Table[2*n*m+m+n+4, {n, 20}, {m, n}] (* Vincenzo Librandi, Jan 29 2012 *)

Prog

(PARI) for(m=1, 9, for(n=1, m, print1(2*m*n+m+n+4", "))) \\ Charles R Greathouse IV, Dec 27 2011

Crossrefs

Cf. A153039, A089192, A155724.

Row sums: A151675. - N. J. A. Sloane, May 31 2009

Sequence in context: A032423 A063724 A317770 * A068591 A065348 A155717

Adjacent sequences: A154682 A154683 A154684 * A154686 A154687 A154688

Keyword

nonn,tabl,easy

Author

Vincenzo Librandi, Jan 18 2009

Extensions

Clarified comment. - R. J. Mathar, Jan 24 2009

Status

approved