Numbers whose base-4 and base-9 expansions have no digits in common.

Terms

a(0) =4a(1) =5a(2) =6a(3) =7a(4) =8a(5) =10a(6) =14a(7) =15a(8) =20a(9) =21a(10) =23a(11) =32a(12) =33a(13) =34a(14) =40a(15) =41a(16) =42a(17) =43a(18) =44a(19) =45a(20) =46a(21) =49a(22) =50a(23) =51a(24) =52a(25) =53a(26) =54a(27) =58a(28) =59a(29) =60