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
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Easy Sequences 8: Triangles with integer sides and prime perimeters
Easy Sequences 36: Hyperbolic Lattice Points
Easy Sequences 26: Prime-Integer Line Segments
Easy Sequences 25: Product of Series
Easy Sequences 55: "Ugly" Rectangles?
Easy Sequences 49: Prime Little Omega Function
Easy Sequences 21: Combinatorial Summations
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