An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number since 1^3 + 5^3 + 3^3 = 153.
Detect a number and replace with two NaN's
Find the logic
Is this triangle right-angled?
length of a vector
Given a 4x4 matrix, swap the two middle columns
Equal to their cube
Basics: 'Find the eigenvalues of given matrix
Who invented zero?
give-nth-decimal-place-of-pi up to 100 digits
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