Composite numbers whose prime factors contain no digits other than 2 and 3.

Terms

a(0) =4a(1) =6a(2) =8a(3) =9a(4) =12a(5) =16a(6) =18a(7) =24a(8) =27a(9) =32a(10) =36a(11) =46a(12) =48a(13) =54a(14) =64a(15) =69a(16) =72a(17) =81a(18) =92a(19) =96a(20) =108a(21) =128a(22) =138a(23) =144a(24) =162a(25) =184a(26) =192a(27) =207a(28) =216a(29) =243