Neopets Random Lottery Links

Button to generate 20 random lottery ticket links on neopets
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// ==UserScript==
// @name         Neopets Random Lottery Links
// @namespace    shiftasterisk
// @version      0.1
// @description  Button to generate 20 random lottery ticket links on neopets
// @author       shiftasterisk
// @match        http://www.neopets.com/games/lottery.phtml
// @include      https://code.jquery.com/jquery-3.1.1.min.js
// @grant        none
// ==/UserScript==

$('input[type="submit"][value="Buy a Lottery Ticket!"]').parent().append("<input id='buyTwenty' type='button' value='Generate Quick Picks'>");
$('input[type="submit"][value="Buy a Lottery Ticket!"]').parent().parent().parent().append("<div id='linkContainer'></div>");

var numberOfTickets = 20;
var tickets = [];

$('#buyTwenty').click(function() {
	tickets = [];
	$("#linkContainer").empty();
	selectTickets();
	displayTicketLinks();
});

function displayTicketLinks() {
	for(x = 0; x < tickets.length; x++) {
		$("#linkContainer").append('<a target="_blank" href="http://www.neopets.com/games/process_lottery.phtml?one=' + tickets[x][0] + '&two=' + tickets[x][1] + '&three=' + tickets[x][2] + '&four=' + tickets[x][3] + '&five=' + tickets[x][4] + '&six=' + tickets[x][5] + '">Ticket ' + (x+1) + '</a><br>');
	}
}

function selectTickets() {
	var ticketsAdded = 0;
	while(ticketsAdded < numberOfTickets) {
		currentTicket = [];
		for(y = 0; y < 6; y++) {
			currentTicket = addNumberToTicket(currentTicket);
		}
		if(!isDuplicateTicket(currentTicket)) {
			tickets.push(currentTicket);
			ticketsAdded++;
            console.log("totalTickets - " + ticketsAdded);
		} else {
            currentTicket = [];
        }
	}
}

function addNumberToTicket(currentTicket){
	var lotteryNumber = Math.round(Math.random() * 29) + 1;
	console.log(currentTicket);
    console.log(lotteryNumber);
    
	if(currentTicket.includes(lotteryNumber)) {
        console.log("duplicate number - going in again");
		currentTicket = addNumberToTicket(currentTicket);
    } else {
		currentTicket.push(lotteryNumber);
    }
	
	return currentTicket;
}

function isDuplicateTicket(currentTicket) {
	for(x = 0; x < tickets.length; x++) {
		if(JSON.stringify(currentTicket.sort()) === JSON.stringify(tickets[x].sort())) {
            console.log("duplicate ticket");
			return true;
        }
	}
	return false;
}