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A039935 Smallest k for which k, 2k, ... nk all contain the digit 4. 9
4, 24, 47, 471, 487, 1248, 1249, 6248, 6249, 6249, 12493, 12493, 12493, 12493, 12498, 31249, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 62499, 312497, 312497, 312497, 624984 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..2047

EXAMPLE

a(3)=47 since 47, 94 and 141 all contain a 4.

CROSSREFS

Cf. A039932, A039933, A039934, A039936, A039937, A039938, A039939, A039940.

Sequence in context: A224242 A066770 A080380 * A090821 A226575 A052645

Adjacent sequences:  A039932 A039933 A039934 * A039936 A039937 A039938

KEYWORD

base,nonn

AUTHOR

Erich Friedman

EXTENSIONS

More terms from Patrick De Geest, Oct 15 1999

STATUS

approved

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Last modified June 2 11:35 EDT 2020. Contains 334771 sequences. (Running on oeis4.)