Numbers whose base-3 representation contains no 0's and exactly one 1.

Terms

a(0) =1a(1) =5a(2) =7a(3) =17a(4) =23a(5) =25a(6) =53a(7) =71a(8) =77a(9) =79a(10) =161a(11) =215a(12) =233a(13) =239a(14) =241a(15) =485a(16) =647a(17) =701a(18) =719a(19) =725a(20) =727a(21) =1457a(22) =1943a(23) =2105a(24) =2159a(25) =2177a(26) =2183a(27) =2185a(28) =4373a(29) =5831