<h2 id="heading-url">URL</h2>
<p><a href="https://leetcode.com/problems/power-of-three/" class="autolinkedURL autolinkedURL-url" target="_blank">leetcode.com/problems/power-of-three</a></p>
<h2 id="heading-code">Code</h2>
<p><a href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0326/main.fsx" class="autolinkedURL autolinkedURL-url" target="_blank">github.com/syohex/dotnet-study/blob/master/..</a></p>
<pre><code class="lang-fsharp">let isPowerOfThree (n: int) : bool =
    let rec isPowerOfThree' (v: int64) (n: int64) (limit: int64) =
        if v &gt; limit then false
        elif n = v then true
        else isPowerOfThree' (v * 3L) n limit

    let limit = System.Int32.MaxValue |&gt; int64
    isPowerOfThree' 1L (n |&gt; int64) limit
</code></pre>


## URL

https://leetcode.com/problems/power-of-three/

## Code

https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0326/main.fsx

```fsharp
let isPowerOfThree (n: int) : bool =
    let rec isPowerOfThree' (v: int64) (n: int64) (limit: int64) =
        if v > limit then false
        elif n = v then true
        else isPowerOfThree' (v * 3L) n limit

    let limit = System.Int32.MaxValue |> int64
    isPowerOfThree' 1L (n |> int64) limit
```

LeetCode 326. Power of Three in F#

URL

Code