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 A023093 #20 Jul 24 2021 08:36:19
%S A023093 0,1089,10089,10449,10890,10899,10989,100089,100449,100890,100899,
%T A023093 100989,102249,104490,104499,106749,107793,107892,108900,108990,
%U A023093 108999,109890,109899,109989,1000089,1000449,1000890,1000899,1000989,1002249,1004490
%N A023093 Numbers k such that k and 9*k are anagrams.
%C A023093 All terms are divisible by 9. - _Eric M. Schmidt_, Jul 12 2014
%H A023093 David W. Wilson, <a href="/A023093/b023093.txt">Table of n, a(n) for n = 1..10001</a>
%t A023093 si[n_] := Sort@ IntegerDigits@ n; Flatten@{0, Table[Select[Range[10^d + 8, 2 10^d - 1, 9], si[#] == si[9 #] &], {d, 0, 6}]} (* _Giovanni Resta_, Mar 20 2017 *)
%Y A023093 Cf. A023086, A023087, A023088, A023089, A023090, A023091, A023092.
%K A023093 nonn,base
%O A023093 1,2
%A A023093 _David W. Wilson_