A328560 Numbers whose product of digits is a power of 10.

1, 11, 25, 52, 111, 125, 152, 215, 251, 455, 512, 521, 545, 554, 1111, 1125, 1152, 1215, 1251, 1455, 1512, 1521, 1545, 1554, 2115, 2151, 2255, 2511, 2525, 2552, 4155, 4515, 4551, 5112, 5121, 5145, 5154, 5211, 5225, 5252, 5415, 5451, 5514, 5522, 5541, 5558, 5585

Offset: 1

Author

Chai Wah Wu, Alois P. Heinz and David A. Corneth, Oct 19 2019

Keywords

• nonn
• base

Comments

All terms must have only 1, 2, 4, 5, 8 as digits.

A subsequence of A328095.

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..27446 (all terms with up to 9 digits)

Crossrefs

Cf. A028846, A276037, A284375, A316315, A326833, A328095.

Programs

Maple

q:= n-> (m-> m>0 and m=10^ilog[10](m))(mul(i, i=convert(n, base, 10))):
select(q, [$1..6000])[];