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.
Project Euler: Problem 7, Nth prime
Column norms of a matrix
Replace multiples of 5 with NaN
Find the logic
Concatenate two strings
Basics: 'Find the eigenvalues of given matrix
Given area find sides
kmph to mps
Given a 4x4 matrix, swap the two middle columns
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