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 A144670 Triangle read by rows where T(m,n)=2mn+m+n-7 3
 -3, 0, 5, 3, 10, 17, 6, 15, 24, 33, 9, 20, 31, 42, 53, 12, 25, 38, 51, 64, 77, 15, 30, 45, 60, 75, 90, 105, 18, 35, 52, 69, 86, 103, 120, 137, 21, 40, 59, 78, 97, 116, 135, 154, 173, 24, 45, 66, 87, 108, 129, 150, 171, 192, 213, 27, 50, 73, 96, 119, 142, 165, 188, 211, 234, 257 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Numbers n such that, if 2^(s-1)=n then [A144487] is not prime. Let p (prime number), n=(p^2-15)/2 mod(p). LINKS Vincenzo Librandi, Rows n = 100, flattened EXAMPLE Triangle begins: -3; 0, 5; 3, 10, 17; 6, 15, 24, 33; 9, 20, 31, 42, 53; 12, 25, 38, 51, 64, 77; 15, 30, 45, 60, 75, 90, 105; 18, 35, 52, 69, 86, 103, 120, 137; 21, 40, 59, 78, 97, 116, 135, 154, 173; 24, 45, 66, 87, 108, 129, 150, 171, 192, 213; = = = = = = = = MATHEMATICA t[n_, k_]:=2 n*k+n+k-7; Table[t[n, k], {n, 12}, {k, n}] // Flatten (* Vincenzo Librandi, Oct 15 2012 *) PROG (Magma) [2*n*k + n + k -7: k in [1..n], n in [1..12]]; // Vincenzo Librandi, Oct 15 2012 CROSSREFS Cf. A057197, A144487. Sequence in context: A225744 A275393 A029840 * A370549 A011078 A354592 Adjacent sequences: A144667 A144668 A144669 * A144671 A144672 A144673 KEYWORD tabl,sign AUTHOR Vincenzo Librandi, Jan 28 2009 STATUS approved

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Last modified June 19 23:45 EDT 2024. Contains 373510 sequences. (Running on oeis4.)