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.
Number of 1s in the Binary Representation of a Number
Is this matrix orthogonal?
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Beginner's Problem - Squaring
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Who invented zero?
kmph to mps
Given a 4x4 matrix, swap the two middle columns
Basics: 'Find the eigenvalues of given matrix
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