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.
Omit columns averages from a matrix
Determine Whether an array is empty
QWERTY Shift Encoder
Lychrel Number Test (Inspired by Project Euler Problem 55)
Compute the effective conductivity of a heterogeneous aquifer
Easy Sequences 27: Product of Radicals of Integers
Easy Sequences 26: Prime-Integer Line Segments
Easy Sequences 20: Counting Prime-sided Rectangles
Easy Sequences 23: Hat Guessing Game!
Easy Sequences 41: Boxes with Integer Edges
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