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 A047505 Numbers that are congruent to {0, 1, 2, 3, 6, 7} mod 8. 1
 0, 1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 30, 31, 32, 33, 34, 35, 38, 39, 40, 41, 42, 43, 46, 47, 48, 49, 50, 51, 54, 55, 56, 57, 58, 59, 62, 63, 64, 65, 66, 67, 70, 71, 72, 73, 74, 75, 78, 79, 80, 81, 82, 83, 86, 87, 88 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,1,-1). FORMULA G.f.: x^2*(1+x+x^2+3*x^3+x^4+x^5) / ( (1+x)*(x^2-x+1)*(1+x+x^2)*(x-1)^2 ). - R. J. Mathar, Nov 06 2015 From Wesley Ivan Hurt, Jun 16 2016: (Start) a(n) = a(n-1) + a(n-6) - a(n-7) for n>7. a(n) = (24*n-27-3*cos(n*Pi)+12*cos(n*Pi/3)-4*sqrt(3)*sin(2*n*Pi/3))/18. a(6k) = 8k-1, a(6k-1) = 8k-2, a(6k-2) = 8k-5, a(6k-3) = 8k-6, a(6k-4) = 8k-7, a(6k-5) = 8k-8. (End) MAPLE A047505:=n->(24*n-27-3*cos(n*Pi)+12*cos(n*Pi/3)-4*sqrt(3)*sin(2*n*Pi/3))/18: seq(A047505(n), n=1..100); # Wesley Ivan Hurt, Jun 16 2016 MATHEMATICA Select[Range[0, 100], MemberQ[{0, 1, 2, 3, 6, 7}, Mod[#, 8]] &] (* Wesley Ivan Hurt, Jun 16 2016 *) PROG (MAGMA) [n : n in [0..100] | n mod 8 in [0, 1, 2, 3, 6, 7]]; // Wesley Ivan Hurt, Jun 16 2016 CROSSREFS Sequence in context: A039102 A287103 A050023 * A039071 A272799 A300157 Adjacent sequences:  A047502 A047503 A047504 * A047506 A047507 A047508 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified September 18 09:22 EDT 2020. Contains 337166 sequences. (Running on oeis4.)