examday

/TMUA

Consider the following three statements:

• 1 $10p^2+1$ and $10p^2-1$ are both prime when $p$ is an odd prime.
• 2 Every prime greater than 5 is of the form $6n+1$ for some integer $n$.
• 3 No multiple of 7 greater than 7 is prime.

The result $91=7\times13$ can be used to provide a counterexample to which of the above statements?