In 2013-2014, author (click here) wrote natural numbers in increasing and decreasing orders of 1 to 9 using only basic operations. See below some examples: For more details and extension work by other see the following link: Inder J. Taneja, The Crazy Representations and 10958 Problem, https://inderjtaneja.com/2018/11/16/crazy-representations-of-natural-numbers-the-10958-problem/ The above study include the natural numbers till 30000. … Continue reading Crazy Representations of Natural Numbers Using Factorial: From 20001-100000