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 A155705 Triangle read by rows where T(m,n) = 2*m*n + m + n + 2. 3
 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: 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; etc. MATHEMATICA t[n_, k_]:=2 n*k + n + k + 2; Table[t[n, k], {n, 11}, {k, n}]//Flatten (* Vincenzo Librandi, Nov 20 2012 *) PROG (Magma) [2*n*k + n + k + 2: k in [1..n], n in [1..11]]; // Vincenzo Librandi, Nov 20 2012 CROSSREFS Cf. A153043, A020725, A016897, A017041. Sequence in context: A176211 A176212 A232553 * A267369 A177891 A228804 Adjacent sequences: A155702 A155703 A155704 * A155706 A155707 A155708 KEYWORD nonn,tabl,easy AUTHOR Vincenzo Librandi, Jan 25 2009 STATUS approved

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Last modified December 5 23:11 EST 2023. Contains 367594 sequences. (Running on oeis4.)