ELI5: Explain Like I'm 5

Integer factorization

Okay kiddo, so you know how when we count, we use numbers like 1, 2, 3, 4, 5, and so on? These numbers are called integers.

Now, let's say we have a bigger number like 12. We can break up 12 into smaller numbers like this: 12 can be written as 6 times 2 (6 x 2 = 12). We call 6 and 2 the factors of 12.

Integer factorization is when we take a big number and figure out what its factors are. This can be tricky sometimes because some numbers have a lot of factors, while others only have a few.

There are different ways to factor a number, but one common method is called prime factorization. This means we break up the number into its prime factors, which are numbers that can only be divided evenly by 1 and themselves.

Let's use 12 as an example again. Its prime factors are 2, 2, and 3. We write it like this:

12 = 2 x 2 x 3

Now we know that the only factors of 12 are 1, 2, 3, 4, 6, and 12.

Mathematicians have been working on integer factorization for a long time because it's important for things like computer security. Some large numbers are used to encrypt important information, and if we can factor them, we can break the encryption and read the information.

So, integer factorization is just a fancy way of breaking up big numbers into smaller factors (like 12 = 6 x 2). We can even find the prime factors of a number, which are numbers that can only be divided evenly by 1 and themselves (like 2, 3, 5, 7, and so on).