OFFSET
1,8
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
KEYWORD
nonn
AUTHOR
John W. Layman, Nov 11 2008
STATUS
approved