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 A125133 #7 Mar 30 2012 17:23:32 %S A125133 4,6,18,20,22,24,26,38,40,42,44,46,58,60,62,64,66,78,80,82,84,86,100, %T A125133 102,104,106,108,112,113,115,117,119,121,122,123,125,127,129,131,132, %U A125133 133,135,137,139,141,142,143,145,147,149,151,153,155,158,161,164,167 %N A125133 Numbers missing from A125132. %C A125133 Digit positions in A125132-with-digits-strung-together where even digits appear. %e A125133 4 and 6 are members because the 4th and 6th digits in that string are even (2 and 8 respectively). %K A125133 base,easy,nonn %O A125133 1,1 %A A125133 _N. J. A. Sloane_, Jan 12 2007 %E A125133 More terms from _D. S. McNeil_, Oct 22 2011