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 A051803 #6 Feb 13 2017 21:06:11 %S A051803 0,1,10,11,25,52,55,100,101,110,111,125,152,155,205,215,250,251,455, %T A051803 502,505,512,515,520,521,545,550,551,554,555,888,1000,1001,1010,1011, %U A051803 1025,1052,1055,1100,1101,1110,1111,1125,1152 %N A051803 Numbers with nonzero multiplicative digital root 1. %H A051803 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %F A051803 A051802^-1(1) %Y A051803 Part of histogram of A051802. %K A051803 nonn,easy,base %O A051803 1,3 %A A051803 _Dan Hoey_, Dec 09 1999