Numbers with a single 2 in their ternary expansion.

Terms

a(0) =2a(1) =5a(2) =6a(3) =7a(4) =11a(5) =14a(6) =15a(7) =16a(8) =18a(9) =19a(10) =21a(11) =22a(12) =29a(13) =32a(14) =33a(15) =34a(16) =38a(17) =41a(18) =42a(19) =43a(20) =45a(21) =46a(22) =48a(23) =49a(24) =54a(25) =55a(26) =57a(27) =58a(28) =63a(29) =64