JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="list">
</ul>

JavaScript

function repeating(x, n){
    return (n) ? (x * Math.pow(10,n-1)) + repeating(x, n-1) : 0;
};

$("ul").append("<li>" + repeating(1,0) + "</li>");
$("ul").append("<li>" + repeating(9,1) + "</li>");
$("ul").append("<li>" + repeating(8,2) + "</li>");
$("ul").append("<li>" + repeating(7,3) + "</li>");
$("ul").append("<li>" + repeating(6,4) + "</li>");