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.
Encode Roman Numerals
Replace NaNs with the number that appears to its left in the row.
Project Euler: Problem 5, Smallest multiple
Get the length of a given vector
Solve an ODE: equation C
Easy Sequences 44: Finding the Smallest Number whose Cube is divisible by a Factorial
Easy Sequences 48: Prime Big Omega of Factorial Sequence
Easy Sequences 10: Sum of Cumsums of Fibonacci Sequence
Easy Sequences 29: Odd proper divisors of odd proper divisors
Easy Sequences 31: N-N's Sequence
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