## Collatz Conjecture

The collatz-conjecture is a simple-looking but still unsolved math problem.

Given any number **n**, will it always break down to 1 after applying the two rules?

The rules:

- If
**n**is even, divide n by 2 - If
**n**is odd, multiply by 3 and add 1

More on this problem, the history and reasoning, and why it hasn't been solved yet: here

This is how the rules above could look like in PHP:

```
$n = 27;
while ($n !== 1) {
if ($n % 2 === 0) {
$n = $n / 2;
} else {
$n = 3 * $n + 1;
}
}
```