Numbers whose prime factors are 2 and 5.

Terms

a(0) =10a(1) =20a(2) =40a(3) =50a(4) =80a(5) =100a(6) =160a(7) =200a(8) =250a(9) =320a(10) =400a(11) =500a(12) =640a(13) =800a(14) =1000a(15) =1250a(16) =1280a(17) =1600a(18) =2000a(19) =2500a(20) =2560a(21) =3200a(22) =4000a(23) =5000a(24) =5120a(25) =6250a(26) =6400a(27) =8000a(28) =10000a(29) =10240