%I #20 Mar 09 2023 17:14:59
%S 1,3,4,5,6,8,10,11,12,13,15,17,18,19,20,22,24,25,26,27,29,31,32,33,34,
%T 36,38,39,40,41,43,45,46,47,48,50,52,53,54,55,57,59,60,61,62,64,66,67,
%U 68,69,71,73,74,75,76,78
%N Numbers that are congruent to {1, 3, 4, 5, 6} mod 7.
%H <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,0,1,-1).
%F G.f.: x*(1 + 2*x + x^2 + x^3 + x^4 + x^5) / ( (x^4 + x^3 + x^2 + x + 1)*(x-1)^2 ). - _R. J. Mathar_, Oct 25 2011
%F a(n) = a(n-1) + a(n-5) - a(n-6). - _Wesley Ivan Hurt_, Mar 09 2023
%t Select[Range[100],MemberQ[{1,3,4,5,6},Mod[#,7]]&] (* _Harvey P. Dale_, Mar 30 2011 *)
%K nonn
%O 1,2
%A _N. J. A. Sloane_