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

Offset: 1

Author

Ray Chandler, Jul 12 2004

Keywords

• base
• nonn

Crossrefs

Cf. A004290, A078241-A078248, A079339, A096681-A096688.

Formula

a(n) = A078248(n)/n.