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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147753 Number of maximum-size subsets of {1,2,3,...,n} whose geometric means are an integer. 2
0, 0, 0, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

For n=4, (1*4)^(1/2)=2 and (1*2*4)^(1/3)=2. No other subset of {1,2,3,4} has integer geometric mean and only one has maximum size 3, so a(4)=1.

CROSSREFS

A147751, A147752

Sequence in context: A107039 A249771 A030615 * A116531 A101871 A101875

Adjacent sequences:  A147750 A147751 A147752 * A147754 A147755 A147756

KEYWORD

nonn

AUTHOR

John W. Layman, Nov 11 2008

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 16:47 EDT 2019. Contains 323597 sequences. (Running on oeis4.)