Project Euler: Problem 1, Multiples of 3 and 5
Project Euler: Problem 6, Natural numbers, squares and sums.
Flip the main diagonal of a matrix
Getting the absolute index from a matrix
Area of a Square
find a specific element from an matrix
Find remainder when x is divided by 3
find the mean of all elements in a matrix
multiply an array by its position number
Find the last digit
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