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.
Prime factor digits
Connect Four Win Checker
Are all the three given point in the same line?
Matrix with different incremental runs
Easy Sequences 41: Boxes with Integer Edges
Easy Sequences 37: Natural Factorable Polynomials
Easy Sequences 13: Average Speed of Spaceship
Easy Sequences 53: Greatest Proper Divisor
Easy Sequences 46: Semi-prime Leap Year Pairs
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