Composite numbers whose prime factors contain no digits other than 3 and 5.

Terms

a(0) =9a(1) =15a(2) =25a(3) =27a(4) =45a(5) =75a(6) =81a(7) =125a(8) =135a(9) =159a(10) =225a(11) =243a(12) =265a(13) =375a(14) =405a(15) =477a(16) =625a(17) =675a(18) =729a(19) =795a(20) =1059a(21) =1125a(22) =1215a(23) =1325a(24) =1431a(25) =1765a(26) =1875a(27) =2025a(28) =2187a(29) =2385