Numbers of form 5^i*6^j, with i, j >= 0.

Terms

a(0) =1a(1) =5a(2) =6a(3) =25a(4) =30a(5) =36a(6) =125a(7) =150a(8) =180a(9) =216a(10) =625a(11) =750a(12) =900a(13) =1080a(14) =1296a(15) =3125a(16) =3750a(17) =4500a(18) =5400a(19) =6480a(20) =7776a(21) =15625a(22) =18750a(23) =22500a(24) =27000a(25) =32400a(26) =38880a(27) =46656a(28) =78125a(29) =93750