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 A047299 Numbers that are congruent to {0, 1, 3, 4, 6} mod 7. 4
 0, 1, 3, 4, 6, 7, 8, 10, 11, 13, 14, 15, 17, 18, 20, 21, 22, 24, 25, 27, 28, 29, 31, 32, 34, 35, 36, 38, 39, 41, 42, 43, 45, 46, 48, 49, 50, 52, 53, 55, 56, 57, 59, 60, 62, 63, 64, 66, 67, 69, 70, 71, 73, 74, 76, 77, 78 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Nonnegative m such that floor(k*m^2/7) = k*floor(m^2/7), where k = 2 or 3. [Bruno Berselli, Dec 03 2015] For k > 1 (A007530(k+1) - A007530(k))/30 is a term in this sequence. - Hugo Pfoertner, May 29 2020 LINKS Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,1,-1). FORMULA G.f.: x^2*(1+2*x+x^2+2*x^3+x^4) / ( (x^4+x^3+x^2+x+1)*(x-1)^2 ). - R. J. Mathar, Oct 25 2011 a(n) = floor((7n-5)/5). - Lorenz H. Menke, Jr., Jun 19 2013 MATHEMATICA a[n_]:=Floor[(7n-5)/5]; Table[a[i], {i, 1, 30}]; (* Lorenz H. Menke, Jr., Jun 19 2013 *) PROG (PARI) a(n)=(7*n-5)\5 \\ Charles R Greathouse IV, Jun 19 2013 (MAGMA) [Floor((7*n-5)/5): n in [1..100]]; // Zaki Khandaker, Jun 21 2015 CROSSREFS Cf. A007530 (prime quadruples). Sequence in context: A247987 A062975 A276218 * A186159 A184578 A022846 Adjacent sequences:  A047296 A047297 A047298 * A047300 A047301 A047302 KEYWORD nonn,easy AUTHOR EXTENSIONS Formula and programs adapted to offset 1 by Michel Marcus, May 30 2020 STATUS approved

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Last modified May 6 01:03 EDT 2021. Contains 343579 sequences. (Running on oeis4.)