dima-kruglyak,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(function(){
var n = 2450, d = $("#num");
(function fn() {
d.text(n);
n+=2
window.setTimeout(fn, 5000)
})();
})
</script>
</head>
<body>
<div id="num"></div>
</body>
</html>