Numbers of the form (9^i)*(13^j), with i, j >= 0.

Terms

a(0) =1a(1) =9a(2) =13a(3) =81a(4) =117a(5) =169a(6) =729a(7) =1053a(8) =1521a(9) =2197a(10) =6561a(11) =9477a(12) =13689a(13) =19773a(14) =28561a(15) =59049a(16) =85293a(17) =123201a(18) =177957a(19) =257049a(20) =371293a(21) =531441a(22) =767637a(23) =1108809a(24) =1601613a(25) =2313441a(26) =3341637a(27) =4782969a(28) =4826809a(29) =6908733