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 A228951 #12 Oct 13 2013 10:10:52 %S A228951 9,11,17,19,21,28,29 %N A228951 Numbers n such that decimal expansion of n^n has only one zero. %C A228951 19 is the median of this finite set of numbers and the only zero of 19^19 is in the middle of it. %t A228951 Select[Range[1000],Count[IntegerDigits[#^#],0]==1&] %Y A228951 Cf.A131495,A229629. %K A228951 nonn,base,fini,full %O A228951 1,1 %A A228951 _Jahangeer Kholdi_, Oct 12 2013