The title and description of this problem have been cleaned up. Also, its test suite has been expanded and improved.
Return the 3n+1 sequence for n
Number of 1s in a binary string
Check if number exists in vector
Create a vector
Find cosine between two given vectors u and v.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Calculate the sum of elements of n*n Hilbert matrix.
Delete x value in given vector y.
Find Euclidean norm of given vector u.
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