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 A032581 #19 Feb 26 2022 13:48:19
%S A032581 1,2,3,4,5,6,7,8,9,15,105,150,213,318,321,426,534,639,642,747,750,855,
%T A032581 963,1050,1896,1941,2130,2750,3180,3210,4260,5340,6390,6420,7470,7500,
%U A032581 8550,9630,12500,14763,29921,54565,87500,125000,604750,849250
%N A032581 Numbers k such that A174141(k) is divisible by k.
%C A032581 Equivalently, numbers k whose decimal representation, read as a base-25 value and divided by k, yields an integer. - _Jon E. Schoenfield_, Oct 25 2019
%t A032581 With[{b = 25}, Array[If[Mod[#2, #1] == 0, #1, Nothing] & @@ {#, FromDigits[IntegerDigits[#], b]} &, 10^6]] (* _Michael De Vlieger_, Oct 06 2019 *)
%Y A032581 Cf. A032582, A174141.
%K A032581 nonn,base
%O A032581 1,2
%A A032581 _Patrick De Geest_, Apr 15 1998
%E A032581 Name clarified and offset changed by _Michael De Vlieger_, Oct 06 2019