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A120008 Smallest k such that the concatenation from 1 to k and back to 1 is divisible by 2n-1, or 0 if no such k exists. 1
1, 3, 0, 6, 3, 2, 6, 0, 109, 103, 6, 100001, 0, 9, 1006, 17, 6, 0, 3, 6, 5, 103, 0, 1000002, 6, 129, 100012, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(29), 2n-1 = 57, is at least 1e8.

LINKS

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

CROSSREFS

Cf. A077189.

Sequence in context: A005889 A095712 A085753 * A162197 A160770 A212225

Adjacent sequences:  A120005 A120006 A120007 * A120009 A120010 A120011

KEYWORD

base,nonn

AUTHOR

Franklin T. Adams-Watters, Jun 02 2006

STATUS

approved

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Last modified August 14 08:08 EDT 2020. Contains 336480 sequences. (Running on oeis4.)