Numbers that are sums of consecutive powers of 3.

Terms

a(0) =1a(1) =3a(2) =4a(3) =9a(4) =12a(5) =13a(6) =27a(7) =36a(8) =39a(9) =40a(10) =81a(11) =108a(12) =117a(13) =120a(14) =121a(15) =243a(16) =324a(17) =351a(18) =360a(19) =363a(20) =364a(21) =729a(22) =972a(23) =1053a(24) =1080a(25) =1089a(26) =1092a(27) =1093a(28) =2187a(29) =2916