Exactly 5 digits from {1,2,3,4,5,6,7,8,9} can precede a(n) to form a lucky number.

Terms

a(0) =19a(1) =27a(2) =31a(3) =41a(4) =253a(5) =409a(6) =567a(7) =663a(8) =827a(9) =833a(10) =977a(11) =1089a(12) =1421a(13) =1475a(14) =2635a(15) =3021a(16) =3419a(17) =3633a(18) =3781a(19) =3953a(20) =4197a(21) =4293a(22) =4423a(23) =4721a(24) =5255a(25) =5671a(26) =6187a(27) =6469a(28) =8187a(29) =8467