A114911 a(n) is the largest base-9 string such that the n-th number coprime to 9 does not divide any substring of a(n).

7, 777, 8787, 886845, 7777777, 878754321, 8888787871, 887885887811, 8878878767816, 878787878787878, 8888888677748678, 888888887867751312, 8787878787873543211, 888878888387777136788, 8888888888486868617568

Offset: 2

Author

Don Reble, Feb 20 2006

Keywords

• nonn
• base

Examples

			a(3) = 777 (base 9) because the 3rd number coprime to 9 is 4, and 4 does not divide any substring of a(3).