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 A073893 #5 Dec 05 2013 19:55:32 %S A073893 1,2,3,2,5,2,5,6,1,0,8,4,9,4,5,6,25,2,15,0,15,10,28,16,25,16,28,16,13, %T A073893 0,14,4,22,36,5,16,35,14,47,0,16,8,42,28,35,18,49,44,27,0,42,4,26,6, %U A073893 45,52,53,38,62,0,44,50,25,28,15,32,43,72,29,0,61,44,45,8,25,56,82,84,85,0 %N A073893 a(10k) = 0 and if n is not a multiple of 10 then a(n) is the smallest positive integer such that the concatenation of the first n terms is a multiple of n. %C A073893 Note that the concatenation of the first 10k terms is not necessarily a multiple of 10k. %Y A073893 Cf. A051883, A073894, A099552. %K A073893 base,nonn,easy %O A073893 1,2 %A A073893 _Amarnath Murthy_, Aug 17 2002 %E A073893 Edited and extended by _David Wasserman_, Oct 21 2004