Suppose that p is prime and p = n 2 + 5 for some natural number n. Prove that the final digit of p i… Show more Suppose that p is prime and p = n 2 + 5 for some natural number n. Prove that the final digit of p is equal to 1 or 9. That is, prove that p ≡ 1( mod 10) or p ≡ 9( mod 10). • Show less