Could not figure out how to speed up my code. Ended up having to use a lookup table to speed it up sufficiently.
There is a shortcut using Mobius Inversion...
I too had problems with the time limit for large arguments and had to resort to a few tricks. But my solution is still general.
Rosenbrock's Banana Function and its derivatives
Calculate the Hamming distance between two strings
What gear ratio does the cyclist need?
Easy Sequences 51: Positive Gaussian Primes
Easy Sequences 21: Combinatorial Summations
Easy Sequences 40: Quadratic Congruence
Easy Sequences 47: Boxes with Prime Edges
Easy Sequences 15: Pythagorean Area with maximum Hypotenuse
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