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.
Times 2 - START HERE
7 segment LED display
Pick the die most likely to win
Easy Sequences 19: Length of Prime-sided Rectangle with Maximum Area
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Easy Sequences 34: Modified Pascal's Triangle
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