References: Inder J. Taneja, Crazy Representations of Natural Numbers – The 10958 Problem,  https://inderjtaneja.com/2018/11/16/crazy-representations-of-natural-numbers-the-10958-problem/Inder J. Taneja, Running Expressions: Increasing and Decreasing Orders https://inderjtaneja.wordpress.com/2017/05/24/running-expressions-increasing-and-decreasing-orders/