Numbers of form 3^i*10^j, with i, j >= 0.

Terms

a(0) =1a(1) =3a(2) =9a(3) =10a(4) =27a(5) =30a(6) =81a(7) =90a(8) =100a(9) =243a(10) =270a(11) =300a(12) =729a(13) =810a(14) =900a(15) =1000a(16) =2187a(17) =2430a(18) =2700a(19) =3000a(20) =6561a(21) =7290a(22) =8100a(23) =9000a(24) =10000a(25) =19683a(26) =21870a(27) =24300a(28) =27000a(29) =30000