Q. Is there an infinite number of primes in the form "p^2+4?"
(Note: 'p' itself is a prime)
3^2+4=13, 5^2+4=29, 7^2+4=53, etc.
+The background for this question is the curiosity for
the equation "p^2+q^2=r" where p, q, r are all prime.
Considering the infiniteness of the solution eventually leads to
the question above.