Hence we've shown that so where . This means is not prime. So we've reached a contradiction.
(Note because otherwise this would imply that which we know to be false.)
I need a hel for find out the answers for the followinf number theory, prime number questions, please give me a help to find out the answers
1.) If p is prime prove that there exist no positive integers a and b s.t. a^2 = pb^2
2.) If [(2^n) -1] is a prime, the n is also a prime
3.) If n>= 5 is a prime number, show that n^2 + 2 is not a prime.
4.) If b(not= 2) is a prime number show that b^2 + (b + 2)^2 + (b + 4)^2 +1 is divisible by 12.
please see the attached file for better understanding of the question