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?
Find the peak 3n+1 sequence value
Renaming a field in a structure array
Flip the main diagonal of a matrix
Matrix with different incremental runs
Equal to their cube
Return a list sorted by number of consecutive occurrences
Narcissistic number ?
Numbers spiral diagonals
Sum of big primes without primes
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