Base-9 Keith numbers.

Terms

a(0) =17a(1) =21a(2) =25a(3) =42a(4) =67a(5) =81a(6) =96a(7) =101a(8) =149a(9) =162a(10) =173a(11) =202a(12) =243a(13) =303a(14) =324a(15) =346a(16) =404a(17) =405a(18) =486a(19) =519a(20) =567a(21) =648a(22) =692a(23) =732a(24) =857a(25) =1189a(26) =1464a(27) =2199a(28) =4398a(29) =11644