for p = 0 mod 4, the number of odd coprime pairs [x,y]

with p^2 = x^2 - y^2 is 2^k where k is the number of distinct

odd prime divisors of p.

David^2

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for p = 0 mod 4, the number of odd coprime pairs [x,y]

with p^2 = x^2 - y^2 is 2^k where k is the number of distinct

odd prime divisors of p.

David^2