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 A030999 #16 Apr 11 2020 04:01:04 %S A030999 0,8,22,36,50,64,78,92,93,95,98,101,104,107,110,114,135,156,177,198, %T A030999 219,239,240,242,245,248,251,254,257,261,282,303,324,345,366,386,387, %U A030999 389,392,395,398,401,404,408,429,450,471,492,513 %N A030999 Position of n-th 0 in A030998. %H A030999 Harvey P. Dale, <a href="/A030999/b030999.txt">Table of n, a(n) for n = 1..1001</a> %t A030999 Rest[Flatten[Position[Flatten[IntegerDigits[#,7]&/@Range[0,200]], 0]]]-1 (* _Harvey P. Dale_, Oct 10 2011 *) %K A030999 nonn,base %O A030999 1,2 %A A030999 _Clark Kimberling_ %E A030999 Missing a(1)=0 inserted by _Sean A. Irvine_, Apr 10 2020