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?
How long is the longest prime diagonal?
03 - Matrix Variables 4
Perfect Square or not
Magic is simple (for beginners)
Two functions (to be sure)
Return a list sorted by number of consecutive occurrences
Chess ELO rating system
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