Project Euler: Problem 6, Natural numbers, squares and sums.
First non-zero element in each column
Change the sign of even index entries of the reversed vector
Who invented zero?
Side of an equilateral triangle
Create logarithmically spaced values (★)
Sum of elements of a vector (★★★)
Replicate elements in vectors (★★★)
Prime number check (★★)
Fill a zeros matrix (★★★★★)
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