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?
Implement simple rotation cypher
sum of non-primes
Return 'on' or 'off'
frame of the matrix
Number of digits in an integer
Find files with extension ext in the current directory
Find my secret number
Permute diagonal and antidiagonal
Generalised Hamming Number
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