Smallest multiple of n using only digits 0 and 9.

Terms

a(0) =9a(1) =90a(2) =9a(3) =900a(4) =90a(5) =90a(6) =9009a(7) =9000a(8) =9a(9) =90a(10) =99a(11) =900a(12) =9009a(13) =90090a(14) =90a(15) =90000a(16) =99909a(17) =90a(18) =99009a(19) =900a(20) =9009a(21) =990a(22) =990909a(23) =9000a(24) =900a(25) =90090a(26) =999a(27) =900900a(28) =9909909a(29) =90