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 A135217 #5 Mar 31 2012 10:28:28 %S A135217 32,448,3747,62498,248998,6244998,31623251,498998998,2449489753, %T A135217 28284271249 %N A135217 a(n) = smallest number with n+1 digits and without zero digits whose squares have the maximal number of zero digits = A135215(n+1). %Y A135217 Cf. A134843, A134844, A134845, A134846, A134847, A134848, A134849, A135215, A135216, A135219. %K A135217 nonn,base %O A135217 2,1 %A A135217 _Artur Jasinski_, Nov 23 2007 %E A135217 a(8)-a(11) from _Lars Blomberg_, Jun 26 2011