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A039938 Smallest k for which k, 2k, ... nk all contain the digit 7. 0
7, 37, 237, 1789, 4357, 14379, 19587, 93957, 189572, 189572, 189597, 189597, 189597, 1234397, 1839597, 1958798, 1983957, 1983957, 1983957, 1983957, 1983957, 1983957, 3978594, 11983957, 19596487, 29195397, 29195397, 29195397 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

a(2)=37 since 37 and 74 contain a 7.

CROSSREFS

Sequence in context: A046235 A144496 A025012 * A102760 A096965 A159597

Adjacent sequences:  A039935 A039936 A039937 * A039939 A039940 A039941

KEYWORD

base,nonn

AUTHOR

Erich Friedman

EXTENSIONS

More terms from Patrick De Geest, Oct 15 1999.

STATUS

approved

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Last modified May 25 22:30 EDT 2013. Contains 225649 sequences.