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 A142069 #19 Dec 12 2023 08:25:25 %S A142069 3,7,2,6,1,5,0,4,8,3,7,2,6,1,5,0,4,8,3,7,2,6,1,5,0,4,8,3,7,2,6,1,5,0, %T A142069 4,8,3,7,2,6,1,5,0,4,8,3,7,2,6,1,5,0,4,8,3,7,2,6,1,5,0,4,8,3,7,2,6,1, %U A142069 5,0,4,8,3,7,2,6,1,5,0,4,8,3,7,2,6,1,5,0,4,8,3,7,2,6,1,5,0,4,8,3,7,2,6,1,5 %N A142069 Period 9: repeat 3, 7, 2, 6, 1, 5, 0, 4, 8. %C A142069 The periodic part contains all digits from 0 to 8 and is a permutation of A141726. %C A142069 Also the continued fractions of (13475 + sqrt(212576401))/8952 and the decimal expansion of 414016720/111111111. %F A142069 a(n) = A141694(n) mod 9. %F A142069 a(n) = a(n-9). %F A142069 G.f.: -x*(3 + 7*x + 2*x^2 + 6*x^3 + x^4 + 5*x^5 + 4*x^7 + 8*x^8)/((x-1)*(1 + x + x^2)*(x^6 + x^3 + 1)). %F A142069 a(3n+1) + a(3n+2) + a(3n+3) = A010851(n). %Y A142069 Cf. A010851, A141694. %K A142069 nonn,easy %O A142069 1,1 %A A142069 _Paul Curtz_, Sep 14 2008 %E A142069 Edited for readability by _R. J. Mathar_, Sep 11 2009