login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified December 18 00:20 EST 2014. Contains 252040 sequences.