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)
Find relatively common elements in matrix rows
Number of 1s in the Binary Representation of a Number
Back to basics 16 - byte order
Sophie Germain prime
Sort complex numbers into complex conjugate pairs
Recaman Sequence - III
Low level NaN
Basic Monte Carlo Simulation
Recaman Sequence - I
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