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November 2022 - Solution

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November 2022 Challenge

November 2022 Solution:

One possible solution is

a =
b =
For the bonus question we have D = 614. One possible method of obtaining this solutions is by converting the equation \frac{a(a-1)}{b(b-1)}=\frac{1}{N} to an equation of the form x^2-dy^2=1.
Such an equation is called **Pell's equation** and there are standard method for solving it and generating all the solutions.