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?
surface of a spherical planet
Determine if a Given Number is a Triangle Number
Create an 'arrow-head" matrix
The sum of the numbers in the vector
Deleting an element in a matrix
Can you beat the lottery again (for hardcore coder) ?
Find Missing Number
Add more zeros
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