# Math Help - Prove that it is composite number

1. ## Prove that it is composite number

I'm trying to solve some problem, but I don't have any good idea to do it
Prove that a2+b3+c6, where a,b,c are positive integers, is always composite number. Thanks for all help

2. ## Re: Prove that it is composite number

Originally Posted by aleschio
Prove that a2+b3+c6, where a,b,c are positive integers, is always composite number. Thanks for all help

But it is not true: let $a=2,~b=2,~\&~c=1$.

3. ## Re: Prove that it is composite number

And what if a,b and c is different from 1?