it's a bit unclear why padding is necessary in the first two test cases, where the number of characters (15) is already a multiple of the key size (3 or 5, respectively)
Return the 3n+1 sequence for n
Is my wife right? Now with even more wrong husband
Project Euler: Problem 6, Natural numbers, squares and sums.
Matrix indexing with two vectors of indices
Derivative of polynomial
Find a real root of a quintic function
Bridge and Torch Problem - Length of Unique Time List
Make visible max values
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