This problem has been polished and the test suite expanded and improved.
Sum all integers from 1 to 2^n
Return the first and last characters of a character array
Insert zeros into vector
Basic arrays operations.
Compute LOG(1+X) in natural log
Select primes from the matrix.
Find Euclidean norm of given vector u.
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Create a square matrix with given conditions
Find hen's weight.
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