1,8

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

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.

A147751, A147752

Sequence in context: A107039 A249771 A030615 * A333355 A116531 A101871

Adjacent sequences: A147750 A147751 A147752 * A147754 A147755 A147756

nonn

John W. Layman, Nov 11 2008

approved