Question 157975
It may seem like every number you try will yield a prime number, but it is not a good idea to generalize like that (you need to prove it somehow). If you try x=41, then 



{{{(41)^2-41+41=41^2+0=41^2=41*41=1681}}}



So this shows that plugging in x=41 gives you a composite number (since 41 is a factor of 1681).