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Use the formula for r2(n) to prove the following:
(a) If n = p, where p is a prime of the form 4k + 1, then r2(n) = 8. This implies that n can be written in a unique way as n = n12 + n22, except for the signs and reordering of n1 and n2.
(b) If n = qa, where q is prime of the form 4k + 3 and a is a positive integer, then r2(n) > 0 if and only if a is even.
(c) In general, n can be represented as the sum of two squares if and only if all the primes of the form 4k + 3 that arise in the prime decomposition of n occur with even exponents.
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