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 A043319 #11 Feb 04 2014 05:52:20 %S A043319 1,2,3,4,5,6,7,8,9,10,11,12,13,14,225,227,228,229,230,231,232,233,234, %T A043319 235,236,237,238,239,450,451,453,454,455,456,457,458,459,460,461,462, %U A043319 463,464,675,676,677,679,680,681,682,683,684 %N A043319 a(n)=A033013(n)/16. %C A043319 Also: Numbers which, written in base 225, have all digits less than 15 and no two adjacent digits equal. - _M. F. Hasler_, Feb 03 2014 %o A043319 (PARI) is_A043319(n)=(n=[n])&&!until(!n[1], ((n=divrem(n[1], 225))[2]<15 && n[1]%15!=n[2])||return) \\ _M. F. Hasler_, Feb 03 2014 %Y A043319 Cf. A043307 - A043320, A043291, A033001 - A033014, A033016 - A033029. %K A043319 nonn,base %O A043319 1,2 %A A043319 _Clark Kimberling_