When expressed in base 3 and then interpreted in base 4, is a multiple of the original number.

Terms

a(0) =0a(1) =1a(2) =2a(3) =53a(4) =91a(5) =182a(6) =194a(7) =273a(8) =546a(9) =582a(10) =948a(11) =1092a(12) =1236a(13) =2184a(14) =2527a(15) =9373a(16) =19238a(17) =28119a(18) =57714a(19) =84357a(20) =173142a(21) =185640a(22) =452807a(23) =21774372a(24) =48833136a(25) =65323116a(26) =1145127998a(27) =3435383994a(28) =4804366457a(29) =11296002941