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A039940 Smallest k for which k, 2k, ... nk all contain the digit 9. 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 * A012111 A138998 A016838

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

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Last modified April 25 04:14 EDT 2019. Contains 322451 sequences. (Running on oeis4.)