---
id: 5900f4151000cf542c50ff28
challengeType: 5
title: 'Problem 169: Exploring the number of different ways a number can be expressed as a sum of powers of 2'
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
```yml
tests:
- text: ''
testString: 'assert.strictEqual(euler169(), 178653872807, "euler169() should return 178653872807.");'
```
## Challenge Seed
```js
function euler169() {
// Good luck!
return true;
}
euler169();
```