Phone Number Finder

Put this in the console :
function mainnumberfinder() {
var nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
var key2 = ((Math.floor((Math.random() * 10)).toString()) + (Math.floor((Math.random() * 10)).toString()) + (Math.floor((Math.random() * 10)).toString()));
var key3 = ((Math.floor((Math.random() * 10)).toString()) + (Math.floor((Math.random() * 10)).toString()) + (Math.floor((Math.random() * 10)).toString()) + (Math.floor((Math.random() * 10)).toString()));
document.getElementById('nums').innerHTML = "(419)-"+ key2+"-"+ key3+""
}

Put this in the HTML :
<html><head><title>Phone Number</title></head><body><button onclick="mainnumberfinder()">Find Phone Number</button>
<div><big id="nums"></big></div></body></html>