Numbers having no 0's and not more than one 1 in their representation in base 3.

Terms

a(0) =1a(1) =2a(2) =5a(3) =7a(4) =8a(5) =17a(6) =23a(7) =25a(8) =26a(9) =53a(10) =71a(11) =77a(12) =79a(13) =80a(14) =161a(15) =215a(16) =233a(17) =239a(18) =241a(19) =242a(20) =485a(21) =647a(22) =701a(23) =719a(24) =725a(25) =727a(26) =728a(27) =1457a(28) =1943a(29) =2105