Problem 1215. Diophantine Equations (Inspired by Project Euler, problem 66)
Consider the quadratic Diophantine equation of the form:
x^2 – Dy^2 = 1
When D=13, the minimal solution in x is 649^2 – 13×180^2 = 1. It can be assumed that there are no solutions in positive integers when D is square.
Given a value of D, find the minimum value of X that gives a solution to the equation.
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