Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
B = [ 1 1 5 5 8 8 ]
Extract leading non-zero digit
So many choices
Sum of first n terms of a harmonic progression
Sum the Digits of a Number
Add a row of zeros on top of a matrix
Solving a quadratic equation
Divisors of an integer
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