Smallest multiple of n using only digits 0 and 4.

Terms

a(0) =4a(1) =4a(2) =444a(3) =4a(4) =40a(5) =444a(6) =4004a(7) =40a(8) =444444444a(9) =40a(10) =44a(11) =444a(12) =4004a(13) =4004a(14) =4440a(15) =400a(16) =44404a(17) =444444444a(18) =44004a(19) =40a(20) =40404a(21) =44a(22) =440404a(23) =4440a(24) =400a(25) =4004a(26) =4404444444a(27) =4004a(28) =4404404a(29) =4440