A096688 Least k such that decimal representation of k*n contains only digits 0 and 9.

9, 45, 3, 225, 18, 15, 1287, 1125, 1, 9, 9, 75, 693, 6435, 6, 5625, 5877, 5, 5211, 45, 429, 45, 43083, 375, 36, 3465, 37, 32175, 341721, 3, 32229, 28125, 3, 29385, 2574, 25, 27, 26055, 231, 225, 2439, 2145, 230463, 225, 2, 215415, 1917, 1875, 202041, 18, 1959