At a minimum, you should make this problem variable. For example, find the element at the ith row and jth column and define i and j in the test cases, which are passed along with the function.
Project Euler: Problem 6, Natural numbers, squares and sums.
Back to basics 8 - Matrix Diagonals
Calculate square and cube of number
Log of a number
first element of matrix
modulus of a number
multiply an array by its position number
Find remainder when x is divided by 3
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