Project Euler: Problem 6, Natural numbers, squares and sums.
Sum of diagonal of a square matrix
Replace Vector Elements
y equals x divided by 2
Divide by 4
Sum of terms in a series 2 (★★★)
Prime number check (★★)
Sum of elements of a vector (★★★)
Vector creation using colon operator
Matrix indexing with two vectors of indices (★★)
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