Numbers of form 5^i*9^j, with i, j >= 0.

Terms

a(0) =1a(1) =5a(2) =9a(3) =25a(4) =45a(5) =81a(6) =125a(7) =225a(8) =405a(9) =625a(10) =729a(11) =1125a(12) =2025a(13) =3125a(14) =3645a(15) =5625a(16) =6561a(17) =10125a(18) =15625a(19) =18225a(20) =28125a(21) =32805a(22) =50625a(23) =59049a(24) =78125a(25) =91125a(26) =140625a(27) =164025a(28) =253125a(29) =295245