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How many positive integers z are there such that x(x + z) = y^{2} has no solutions in positive integers x, y? Crux Mathematicorum, Sept. 2006, p. 288, Colombian Math Olympiad. © Copyright 2007 Stan Wagon. Reproduced with permission.
How many positive integers z are there such that x(x + z) = y^{2} has no solutions in positive integers x, y?
Crux Mathematicorum, Sept. 2006, p. 288, Colombian Math Olympiad.
© Copyright 2007 Stan Wagon. Reproduced with permission.
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