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 A199985 #14 Jan 13 2021 17:57:20
%S A199985 5,15,51,115,151,511,1115,1151,1511,5111,11115,11151,11511,15111,
%T A199985 51111,111115,111151,111511,115111,151111,511111,1111115,1111151,
%U A199985 1111511,1115111,1151111,1511111,5111111,11111115,11111151,11111511,11115111,11151111,11511111
%N A199985 Numbers with digital product = 5.
%C A199985 Subsequence of A034052.
%H A199985 Harvey P. Dale, <a href="/A199985/b199985.txt">Table of n, a(n) for n = 1..10000</a>
%p A199985 f:= proc(d) local b,i;
%p A199985 b:= (10^d-1)/9;
%p A199985 seq(b+4*10^i,i=0..d-1);
%p A199985 end proc:
%p A199985 seq(f(d),d=1..9);
%t A199985 Sort[FromDigits/@Flatten[Table[Permutations[PadRight[{5},n,1]],{n,9}],1]] (* _Harvey P. Dale_, Sep 03 2016 *)
%K A199985 nonn,base
%O A199985 1,1
%A A199985 _Jaroslav Krizek_, Nov 13 2011