Numbers with exactly 3 2's in their ternary expansion.

Terms

a(0) =26a(1) =53a(2) =62a(3) =71a(4) =74a(5) =77a(6) =78a(7) =79a(8) =107a(9) =134a(10) =143a(11) =152a(12) =155a(13) =158a(14) =159a(15) =160a(16) =170a(17) =179a(18) =182a(19) =185a(20) =186a(21) =187a(22) =197a(23) =206a(24) =209a(25) =212a(26) =213a(27) =214a(28) =218a(29) =221