Inspired by Problem 1025 and Project Euler 12.
Given n, return the number y of integers that divide N.
For example, with n = 10, the divisors are [1 2 5 10], so y = 4.
It's easy with normal integer but how to proceed with big number?
Sophie Germain prime
Simple equation: Annual salary
Narcissistic number ?
Area of a triangle
Find my secret number
Numbers spiral diagonals (Part 1)
Mirror, mirror on the wall, who is fairest of them all?
Find the path through the cell
Two functions (to be sure)
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