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, Semi-Selfie Representations, https://inderjtaneja.com/2017/07/11/semi-selfie-numbers/Inder J. Taneja, Patterns in Semi-Selfie Numbers, https://inderjtaneja.com/2017/08/21/patterns-in-semi-selfie-numbers/Inder J. Taneja, Single Digits Representations, https://inderjtaneja.com/2019/01/01/single-letter-representations-of-numbers-from-1-to-20000/