Powerful numbers (4,8,9,16,25,27... )are defined as follows: if a prime p divides n then p² must also divide n.
(8,9) is a couple of two consecutive numbers,both of them being powerful.
Find another pair(s) like that.

The more the merrier!!

(In reply to Definition by Gamer)

Wolfram Math's definition:

An integer   m such that if  p divides m then p^2 divides m , is called a powerful number.

is not differentt from mine.

Posted by Ady TZIDON on 2010-08-10 18:49:07