When expressed in base 2 and then interpreted in base 3, is a multiple of the original number.

Terms

a(0) =0a(1) =1a(2) =5a(3) =6a(4) =10a(5) =12a(6) =30a(7) =36a(8) =60a(9) =120a(10) =180a(11) =215a(12) =216a(13) =252a(14) =360a(15) =430a(16) =432a(17) =1080a(18) =2730a(19) =3276a(20) =13710a(21) =14724a(22) =16380a(23) =20520a(24) =24624a(25) =24840a(26) =27125a(27) =27420a(28) =32760a(29) =38880