> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/d/disarium_numbers.md).

# Disarium numbers

```ruby
func is_disarium(n) {
    n.digits.flip.sum_kv{|k,d| d**(k+1) } == n
}
 
say 18.by(is_disarium)
```

#### Output:

```
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 89, 135, 175, 518, 598, 1306, 1676, 2427]
```