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 A138886 #5 Mar 30 2012 17:33:54 %S A138886 0,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1, %T A138886 1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0, %U A138886 0,0,0,0,0,0,0,0,0,0,0 %N A138886 n-th run has length n-th nonprime number A018252, with digits 0 and 1 only, starting with 0. %C A138886 Also the n-th run has length A141468, with digits 0 and 1 only, starting with 1. %e A138886 .n ..... Run ................... Length %e A138886 .1 ..... 0 ..................... 1 %e A138886 .2 ..... 1,1,1,1 ............... 4 %e A138886 .3 ..... 0,0,0,0,0,0 ........... 6 %e A138886 .4 ..... 1,1,1,1,1,1,1,1 ....... 8 %e A138886 .5 ..... 0,0,0,0,0,0,0,0,0 ..... 9 %Y A138886 Cf. A057211, A138149, A138150, A138709, A138710, A138711, A138712, A138885. %K A138886 easy,nonn %O A138886 1,1 %A A138886 _Omar E. Pol_, Apr 06 2008