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.
Determine if input is odd
Spherical radius given four points
Divisible by 7
Easy Sequences 41: Boxes with Integer Edges
Easy Sequences 9: Faithful Pairs
Easy Sequences 3: Prime 44-number Squares
Easy Sequences 15: Pythagorean Area with maximum Hypotenuse
Easy Sequences 30: Nearly Pythagorean Triangles
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