Sums of 2 distinct powers of 3.

Terms

a(0) =4a(1) =10a(2) =12a(3) =28a(4) =30a(5) =36a(6) =82a(7) =84a(8) =90a(9) =108a(10) =244a(11) =246a(12) =252a(13) =270a(14) =324a(15) =730a(16) =732a(17) =738a(18) =756a(19) =810a(20) =972a(21) =2188a(22) =2190a(23) =2196a(24) =2214a(25) =2268a(26) =2430a(27) =2916a(28) =6562a(29) =6564