Prime Factors

Date: 01/28/2006 at 18:59:06
From: Cookie
Subject: (no subject)

What is a number with only two prime factors and no repeated factors?

Date: 01/28/2006 at 23:09:18
From: Doctor Ricky
Subject: Re: 

Hi Cookie,

Thanks for writing Dr. Math!

Actually there are an infinite number of numbers with only two prime 
factors and no repeated factors.  To find one, think of two prime 
numbers.  Now multiply them together once (so there are no repeated 
factors).  Your result is a number with only two prime factors and 
no repeated factors. :-)

Example:

Pick two prime numbers.  How about 2 and 3?

Now, multiply them together once.

  2*3 = 6

Therefore, 6 has only two prime factors and no repeated factors.

If you have any questions or if this was a little confusing, please 
let me know!

- Doctor Ricky, The Math Forum
  http://mathforum.org/dr.math/