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?
Remove all the words that end with "ain"
Find state names that end with the letter A
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Mersenne Primes vs. All Primes
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Pandigital number n°2 (Inspired by Project Euler 32)
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