js :: numbers of wirth

gistfile1.js

/*
 * Numbers of Wirth
 * Solution to http://programmingpraxis.com/2012/12/07/wirth-problem-15-12/2/
 *
 * Author: Chandrasekhar Thotakura
 */
(function (N) {
	'use strict';
	var wirth = {
		queue: [1],
		series: [],
		insert: function (x) {
			var len = this.queue.length, i = 0;
			if (len) {
				while (i < len && this.queue[i] < x) {
					i += 1;
				}
			}
			if (this.queue[i] !== x) {
				this.queue.splice(i, 0, x);
			}
		},
		generate: function () {
			var head;
			while (this.queue.length) {
				head = this.queue.shift();
				if (this.series.length < N) {
					this.series.push(head);
					this.insert(2 * head + 1);
					this.insert(3 * head + 1);
				}
			}
		}
	};
	wirth.generate();
	return wirth.series;
}(100));