Composite numbers whose prime factors contain no digits other than 3 and 8.

Terms

a(0) =9a(1) =27a(2) =81a(3) =243a(4) =249a(5) =729a(6) =747a(7) =1149a(8) =2187a(9) =2241a(10) =2649a(11) =3447a(12) =6561a(13) =6723a(14) =6889a(15) =7947a(16) =10341a(17) =11499a(18) =19683a(19) =20169a(20) =20667a(21) =23841a(22) =31023a(23) =31789a(24) =34497a(25) =59049a(26) =60507a(27) =62001a(28) =71523a(29) =73289