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[tex] x^2 - Dy^2 = 1 [/tex]

Given an integral value for D that is not a square number, find the minimal values of x and y where x and y are both integers.

I've seen stuff about using continued fractions or finding values for x and y once given the minimal values of x and y but I can't make head nor tale of it all. The Mathworld page on Pell equations gives a lot of information but most of it is irrelevant. Near the bottom they show a table of the results I want to acheive but they don't mention how those values in the table were found. Any ideas?