I have this script that makes a button redirect to a whatsapp page, on the URL (a href) I need to insert the number that's gonna be contacted.

What I need to do is each day a different number fills this URL.
Example:

day1 - phonen1,

day2 - phonen2,

...,

day 13 - phonen13,

//(starts over)

day14 - phonen1,

day15 - phonen2,

...

```
<a id="whatsapp" target="_blank" href="https://api.whatsapp.com/send?phone=5519997820734">Link</a>

<script>

    phones= ["phonen1", "phonen2", ..., "phonen13"];
    document.getElementById("whatsapp").href = "https://api.whatsapp.com/send?phone=5519"+ phones[i] +"";  

</script>

```