In this short set of numbers two do not belong:
1, 16, 64, 512, 4096, 46656, 1000000, 2985984

Why?

The numbers which belong have two special properties. Those not conforming have one of these which is not the same for each of them.

(In reply to One Solution (spoiler?) by Kenny M)

I guess a simpler way of saying it is that every other number has an integer 6th root.

 

Posted by Charlie on 2007-04-29 16:41:06