When expressed in base 3 and then interpreted in base 6, is a multiple of the original number.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =18a(7) =27a(8) =32a(9) =36a(10) =54a(11) =68a(12) =72a(13) =81a(14) =96a(15) =108a(16) =162a(17) =204a(18) =216a(19) =243a(20) =252a(21) =276a(22) =288a(23) =324a(24) =486a(25) =504a(26) =612a(27) =648a(28) =729a(29) =756