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 A029749 Numbers of the form 2^k times 1, 5 or 7. 1
 1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 40, 56, 64, 80, 112, 128, 160, 224, 256, 320, 448, 512, 640, 896, 1024, 1280, 1792, 2048, 2560, 3584, 4096, 5120, 7168, 8192, 10240, 14336, 16384, 20480, 28672, 32768, 40960, 57344, 65536, 81920, 114688, 131072 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (0,0,2). FORMULA From Colin Barker, Jul 19 2013: (Start) a(n) = 2*a(n-3) for n>4. G.f.: -(3*x^4 + 3*x^3 + 4*x^2 + 2*x + 1) / (2*x^3 - 1). (End) Sum_{n>=0} 1/a(n) = 94/35. - Amiram Eldar, Jan 21 2022 MATHEMATICA CoefficientList[Series[-(3 x^4 + 3 x^3 + 4 x^2 + 2 x + 1) / (2 x^3 - 1), {x, 0, 40}], x] (* Vincenzo Librandi, Jul 20 2013 *) CROSSREFS Cf. A000079, A005009, A029746, A029748, A094958. Sequence in context: A326669 A123064 A108513 * A018519 A050054 A018371 Adjacent sequences: A029746 A029747 A029748 * A029750 A029751 A029752 KEYWORD nonn,easy AUTHOR EXTENSIONS More terms from Colin Barker, Jul 19 2013 STATUS approved

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Last modified March 30 14:15 EDT 2023. Contains 361622 sequences. (Running on oeis4.)