[closeparen]

You really don’t need to understand the math or how to prove anything about Fermat’s theorem, fixed points, or primality. It’s just the “business context” surrounding the requirements, which are specified well enough. I agree it might cause some unnecessary confusion if the reader is not able to put it “in a box” and just look at the algorithm, but really, putting it in a box works.

Later on there is a bunch of differential equations. I’ve been taught about differential equations for a week or two in calculus but I couldn’t solve one to save my life. It doesn’t matter. Solving the exercises doesn’t require it.