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 A085630 #19 Sep 20 2024 12:26:43
%S A085630 0,9,36,95,197,356,579,882,1272,1767,2381,3113,3984,5002,6187,7545,
%T A085630 9081,10815,12759,14927,17323,19960,22853,26015,29458,33188,37222,
%U A085630 41568,46245,51254,56618,62338,68437,74917,81793,89083,96786,104926,113511
%N A085630 Number of n-digit 7-smooth numbers (A002473).
%H A085630 Lars Blomberg, <a href="/A085630/b085630.txt">Table of n, a(n) for n = 0..100</a>
%F A085630 From _Andrew Howroyd_, Sep 20 2024: (Start)
%F A085630 a(n) = A106600(n) - A106600(n-1) for n > 0.
%F A085630 a(n) = A071604(10^n-1) - A071604(10^(n-1)-1) for n > 1. (End)
%o A085630 (PARI) \\ Here b(n) is A071604.
%o A085630 b(m)={sum(i=0, logint(m,7), my(p=m\7^i); sum(j=0, logint(p,5), my(q=p\5^j); sum(k=0, logint(q,3), logint(q\3^k,2)+1 )))}
%o A085630 a(n)={if(n>0, b(10^n-1))-if(n>1, b(10^(n-1)-1))} \\ _Andrew Howroyd_, Sep 20 2024
%Y A085630 Cf. A002473, A071604, A106600.
%K A085630 base,nonn
%O A085630 0,2
%A A085630 _Jason Earls_ and _Amarnath Murthy_, Jul 10 2003
%E A085630 More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Nov 18 2004
%E A085630 Name changed by _Andrew Howroyd_, Sep 20 2024