---
id: 5900f4491000cf542c50ff5c
challengeType: 5
title: 'Problem 221: Alexandrian Integers'
---
## Description
We shall call a positive integer A an "Alexandrian integer", if there exist integers p, q, r such that:
A = p · q · r and
1A
=
1p
+
1q
+
1r
For example, 630 is an Alexandrian integer (p = 5, q = −7, r = −18).
In fact, 630 is the 6th Alexandrian integer, the first 6 Alexandrian integers being: 6, 42, 120, 156, 420 and 630.
Find the 150000th Alexandrian integer.
## Instructions
## Tests
```yml
tests:
- text: euler221() should return 1884161251122450.
testString: assert.strictEqual(euler221(), 1884161251122450, 'euler221() should return 1884161251122450.');
```
## Challenge Seed
```js
function euler221() {
// Good luck!
return true;
}
euler221();
```