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A159458 Numbers n such that n^2 divides A159068(n), where A159068(n) = sum{k=1 to n} binomial(n,k) * GCD(n,k). 1
1, 2, 3, 11, 33, 309, 665, 1461, 2323, 6789 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

n divides A159068(n) for all positive integers n.

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Cf. A159068, A159069

Sequence in context: A032357 A144056 A062630 * A057838 A219497 A006497

Adjacent sequences:  A159455 A159456 A159457 * A159459 A159460 A159461

KEYWORD

more,nonn

AUTHOR

Leroy Quet, Apr 12 2009

EXTENSIONS

4 more terms from R. J. Mathar, Apr 16 2009

a(10)=6789 from Ray Chandler, Jun 19 2009

STATUS

approved

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Last modified April 24 12:32 EDT 2014. Contains 240983 sequences.