[рони]

j0hnik,
один цикл

var arr = [9, 9, 9, 111, 5, 2,  3, 4, 4, 5, 5, 5, 7];
function fn(d, e) {
    for (var f = [], b = {}, a, c = 0; c < d.length; c++)
    a = d[c], b[a] >= e || (b[a]++ || (b[a] = 1), b[a] >= e && f.push(a));
    return f
};
alert(fn(arr, 3));