Computing the period of the continued fraction expansion of √d
The algorithm is based on K. Rosen, Elementary number theory and its applications, p.382, using the Pohst-Zassenhaus device of half the period k. See note,
where it is shown that Qh = Qh+1 if k = 2h + 1, while Ph = Ph+1 if k = 2h.
Last modified 16th February 2007
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