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)
Project Euler: Problem 2, Sum of even Fibonacci
Project Euler: Problem 6, Natural numbers, squares and sums.
Back to basics 12 - Input Arguments
Is A the inverse of B?
Solving a quadratic equation
Find a real root of a quintic function
Bridge and Torch Problem - Probability
Area under standard normal curve
Challenging perms function!
Low level NaN
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