Using RUBY:

A McNugget Number is a positive integer that can be obtained by adding together orders of McDonald's Chicken McNuggets, which come in boxes of 4, 6, 9, and 20 pieces. Write a program in Ruby that finds all positive integers less than some number N that are not McNugget Numbers.

Write additional helper functions for each of these problems and take advantage of predefined methods instead of trying to implement these functions by yourself.