Return double factorial
n(n-2)...(5)(3)(1), n>0, odd
n!! = n(n-2)...(6)(4)(2), n>0, even
1 , n = -1, or n = 0
6!! = (6)(4)(2) = 48
Neither n = -1, nor n = 0 are tested.
Project Euler: Problem 3, Largest prime factor
Make one big string out of two smaller strings
Reindex a vector
Generate pi using logarithm
Given area find sides
Happy Free Wednesday!
longest sequence of nans
Cryptography with A Square Matrix : Encoding
Fill the Matrix - 2
Recaman Sequence - III
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