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 A043313 #8 Feb 03 2014 12:43:44 %S A043313 1,2,3,4,5,6,7,8,81,83,84,85,86,87,88,89,162,163,165,166,167,168,169, %T A043313 170,243,244,245,247,248,249,250,251,324,325,326,327,329,330,331,332, %U A043313 405,406,407,408,409,411,412,413,486,487,488 %N A043313 a(n)=A033007(n)/10. %C A043313 Also: Numbers which, written in base 81, have only digits 0,...,8, and no two adjacent digits equal. - _M. F. Hasler_, Feb 03 2014 %o A043313 (PARI) is_A043313(n)=(n=[n])&&!until(!n[1],((n=divrem(n[1],81))[2]<9 && n[1]%9!=n[2])||return) \\ _M. F. Hasler_, Feb 03 2014 %Y A043313 Cf. A043307 - A043320, A043291, A033001 - A033014, A033016 - A033029. %K A043313 nonn,base %O A043313 1,2 %A A043313 _Clark Kimberling_