A039940 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

EXAMPLE

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

CROSSREFS

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

Sequence in context: A110873 A167716 A087352 * A369963 A012111 A138998

Adjacent sequences: A039937 A039938 A039939 * A039941 A039942 A039943

KEYWORD

base,nonn

AUTHOR

Erich Friedman

EXTENSIONS

More terms from Patrick De Geest, Oct 15 1999

STATUS

approved