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 A113556 #4 Dec 05 2013 19:57:06 %S A113556 1,110,111,10012,100010,1000014,1000041,100000016,100000071, %T A113556 10000000010,10000000021,1000000000116,1000000000051,100000000000012, %U A113556 1000000000000110,10000000000000016,10000000000000101,1000000000000000116 %N A113556 Least multiple of n in which the n-th digit from left is 1. %e A113556 a(4)= 10012, in which the fourth digit is 1. %Y A113556 Cf. A113557. %K A113556 base,easy,nonn %O A113556 1,2 %A A113556 _Amarnath Murthy_, Nov 06 2005 %E A113556 More terms from _Joshua Zucker_, May 03 2006