A039940 Smallest k for which k, 2k, ... nk all contain the digit 9.

9, 49, 97, 98, 98, 99, 99, 99, 99, 99, 99, 499, 992, 993, 993, 994, 994, 994, 995, 995, 995, 995, 996, 996, 996, 996, 996, 997, 997, 997, 997, 997, 997, 997, 997, 997, 997, 998, 998, 998, 998, 998, 998, 998, 998, 998, 998, 998, 998, 998, 998, 998, 998, 998

Offset: 1

Author

Erich Friedman

Keywords

• base
• nonn

Examples

			a(11)=99 since 99, 198, 297, 396, 495, 594, 693, 792, 891, 990, and 1089 all contain a 9.
		

Links

• Giovanni Resta, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A039932, A039933, A039934, A039935, A039936, A039937, A039938, A039939.

Extensions

More terms from Patrick De Geest, Oct 15 1999