Numbers of the form 2^i*5^j with i, j >= 0.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =8a(5) =10a(6) =16a(7) =20a(8) =25a(9) =32a(10) =40a(11) =50a(12) =64a(13) =80a(14) =100a(15) =125a(16) =128a(17) =160a(18) =200a(19) =250a(20) =256a(21) =320a(22) =400a(23) =500a(24) =512a(25) =625a(26) =640a(27) =800a(28) =1000a(29) =1024