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 A328560 #22 Oct 21 2019 10:19:37 %S A328560 1,11,25,52,111,125,152,215,251,455,512,521,545,554,1111,1125,1152, %T A328560 1215,1251,1455,1512,1521,1545,1554,2115,2151,2255,2511,2525,2552, %U A328560 4155,4515,4551,5112,5121,5145,5154,5211,5225,5252,5415,5451,5514,5522,5541,5558,5585 %N A328560 Numbers whose product of digits is a power of 10. %C A328560 All terms must have only 1, 2, 4, 5, 8 as digits. %C A328560 A subsequence of A328095. %H A328560 Alois P. Heinz, <a href="/A328560/b328560.txt">Table of n, a(n) for n = 1..27446</a> (all terms with up to 9 digits) %p A328560 q:= n-> (m-> m>0 and m=10^ilog[10](m))(mul(i, i=convert(n, base, 10))): %p A328560 select(q, [$1..6000])[]; %Y A328560 Cf. A028846, A276037, A284375, A316315, A326833, A328095. %K A328560 nonn,base %O A328560 1,2 %A A328560 _Chai Wah Wu_, _Alois P. Heinz_ and _David A. Corneth_, Oct 19 2019