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 A173485 #2 Mar 30 2012 19:00:22 %S A173485 100,1000,30000,100000,1000000,30000000,700000000,1000000000, %T A173485 90000000000,100000000000,0,30000000000000,0,7000000000000000, %U A173485 30000000000000000 %N A173485 a(n) = the smallest (n+2)-digit number ending in n+1 zeros that is divisible by n, else 0. %C A173485 See A173478 - A173486. %K A173485 nonn,base %O A173485 1,1 %A A173485 _Jaroslav Krizek_, Feb 19 2010