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 ]
The Goldbach Conjecture
give nth decimal place of pi
Project Euler: Problem 8, Find largest product in a large string of numbers
Multiply 2 numbers
Divisors of an integer
Solving a quadratic equation
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