Smallest k for which k, 2k, ... nk all contain the digit 9.

Terms

a(0) =9a(1) =49a(2) =97a(3) =98a(4) =98a(5) =99a(6) =99a(7) =99a(8) =99a(9) =99a(10) =99a(11) =499a(12) =992a(13) =993a(14) =993a(15) =994a(16) =994a(17) =994a(18) =995a(19) =995a(20) =995a(21) =995a(22) =996a(23) =996a(24) =996a(25) =996a(26) =996a(27) =997a(28) =997a(29) =997