This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A164743 #12 Dec 12 2023 08:10:20 %S A164743 3,3,6,9,6,6,3,9,3,3,6,9,6,6,3,9,3,3,6,9,6,6,3,9,3,3,6,9,6,6,3,9 %N A164743 Digital root of 3*A000045(n). %C A164743 Period 8. %H A164743 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,1) %F A164743 a(n+1) = sum of digits of a(n) + a(n-1). %F A164743 a(n) = A010888(3*A000045(n)). - _R. J. Mathar_, Nov 03 2016 %F A164743 G.f.: -3*x*(1+x+2*x^2+3*x^3+2*x^4+2*x^5+x^6+3*x^7) / ( (x-1)*(1+x)*(x^2+1)*(x^4+1) ). - _R. J. Mathar_, Nov 03 2016 %Y A164743 Cf. A049341,A000045,A030132,A082115 %K A164743 nonn,base,easy %O A164743 1,1 %A A164743 _Mark Dols_, Aug 24 2009