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 A135628 Multiples of 28. 4
 0, 28, 56, 84, 112, 140, 168, 196, 224, 252, 280, 308, 336, 364, 392, 420, 448, 476, 504, 532, 560, 588, 616, 644, 672, 700, 728, 756, 784, 812, 840, 868, 896, 924, 952, 980, 1008, 1036, 1064, 1092, 1120, 1148, 1176, 1204, 1232, 1260, 1288, 1316, 1344, 1372 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081 [math.CO], 2014. Index entries for linear recurrences with constant coefficients, signature (2,-1) FORMULA a(n) = 28*n. From G. C. Greubel, Oct 24 2016: (Start) G.f.: (28*x)/(1 - x)^2. E.g.f.: 28*x*exp(x). a(n) = 2*a(n-1) - a(n-2). (End) EXAMPLE a(9) = 28*9 = 252. MATHEMATICA Range[0, 3000, 28] (* Vladimir Joseph Stephan Orlovsky, Jun 03 2011 *) LinearRecurrence[{2, -1}, {0, 28}, 25] (* G. C. Greubel, Oct 24 2016 *) CROSSREFS Cf. A008588, A008596, A127777. Sequence in context: A079731 A119168 A040756 * A204646 A211491 A270297 Adjacent sequences:  A135625 A135626 A135627 * A135629 A135630 A135631 KEYWORD easy,nonn AUTHOR Omar E. Pol, Nov 25 2007 STATUS approved

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