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?
Add more zeros
Is the input divisible by 3?
Compute Fibonacci Number
length of a vector
Return a list sorted by number of consecutive occurrences
Decrypt the cypher using XOR encryption (for beginners)
I want to know everything!
Two functions (to be sure)
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