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A155705

Triangle read by rows where T(m,n) = 2*m*n + m + n + 2.

6, 9, 14, 12, 19, 26, 15, 24, 33, 42, 18, 29, 40, 51, 62, 21, 34, 47, 60, 73, 86, 24, 39, 54, 69, 84, 99, 114, 27, 44, 61, 78, 95, 112, 129, 146, 30, 49, 68, 87, 106, 125, 144, 163, 182, 33, 54, 75, 96, 117, 138, 159, 180, 201, 222, 36, 59, 82, 105, 128, 151

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

2*T(m,n)-3 = (2*m+1)*(2*n+1) is not prime, obviously. Also: first column: 3*A020725; second column: A016897; third column: A017041; fourth column: 3*A016789. - Vincenzo Librandi, Nov 20 2012

LINKS

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

EXAMPLE

Triangle begins:

9, 14;

12, 19, 26;

15, 24, 33, 42;

18, 29, 40, 51, 62;

21, 34, 47, 60, 73, 86;

24, 39, 54, 69, 84, 99, 114;

27, 44, 61, 78, 95, 112, 129, 146;

30, 49, 68, 87, 106, 125, 144, 163, 182;