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A244927 Least positive number k such that k*n written in base 10 is either a repunit or of the form 1111....0000. 1
1, 5, 37, 25, 2, 185, 15873, 125, 12345679, 1, 1, 925, 8547, 79365, 74, 625, 65359477124183, 61728395, 5847953216374269, 5, 5291, 5, 48309178743961352657, 4625, 4, 42735, 4115226337448559670781893, 396825 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..100

FORMULA

a(n) = A244859(n)/n.

EXAMPLE

For n = 7, 15873*7 = 111111 and this is the least positive multiple of 7 that is either a repunit or of the form 1111...000.

CROSSREFS

Cf. A244859, A079339, A004290. Equal to A079339 for the first 6 terms.

Sequence in context: A157809 A079339 A257343 * A043075 A106129 A096673

Adjacent sequences:  A244924 A244925 A244926 * A244928 A244929 A244930

KEYWORD

nonn,base

AUTHOR

Chai Wah Wu, Jul 08 2014

STATUS

approved

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Last modified June 5 12:47 EDT 2020. Contains 334840 sequences. (Running on oeis4.)