33030domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 0, 1, 3, 8 and 9.at n=54A136852Numbers whose decimal expansion contains only 0's and 3's.at n=26A169966The poor sandwiches sequence (see Comments lines for definition).at n=10A335600a(n) = Sum_{d|n} d^(n/d) * binomial(n/d,d).at n=17A376016