---
id: 5900f41e1000cf542c50ff31
challengeType: 5
title: 'Problem 178: Step Numbers'
---
## Description
Consider the number 45656.
It can be seen that each pair of consecutive digits of 45656 has a difference of one.
A number for which every pair of consecutive digits has a difference of one is called a step number.
A pandigital number contains every decimal digit from 0 to 9 at least once.
How many pandigital step numbers less than 1040 are there?
## Instructions
## Tests
```yml
tests:
- text: euler178() should return 126461847755.
testString: assert.strictEqual(euler178(), 126461847755, 'euler178() should return 126461847755.');
```
## Challenge Seed
```js
function euler178() {
// Good luck!
return true;
}
euler178();
```