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 A008603 Multiples of 21. 11
 0, 21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, 294, 315, 336, 357, 378, 399, 420, 441, 462, 483, 504, 525, 546, 567, 588, 609, 630, 651, 672, 693, 714, 735, 756, 777, 798, 819, 840, 861, 882, 903, 924, 945, 966, 987 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Sum of the numbers from 3*(n-1) to 3*(n+1). - Bruno Berselli, Oct 25 2018 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Tanya Khovanova, Recursive Sequences INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 333 Index entries for linear recurrences with constant coefficients, signature (2, -1). FORMULA G.f.: 21*x/(x-1)^2. - Vincenzo Librandi, Jun 10 2013 MATHEMATICA Range[0, 1500, 21] (* Vladimir Joseph Stephan Orlovsky, Jun 01 2011 *) CoefficientList[Series[21 x / (x - 1)^2, {x, 0, 60}], x] (* Vincenzo Librandi, Jun 10 2013 *) PROG (PARI) a(n)=21*n \\ Charles R Greathouse IV, Oct 07 2015 CROSSREFS Cf. A008601, A008602. Sequence in context: A037978 A089059 A114384 * A235497 A086794 A001682 Adjacent sequences: A008600 A008601 A008602 * A008604 A008605 A008606 KEYWORD nonn,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified August 8 03:39 EDT 2024. Contains 375018 sequences. (Running on oeis4.)