References: Inder J. Taneja, 2020 In Numbers: Mathematical Style – Revised,  Zenodo, December 31, 2019, pp. 1-37,   http://doi.org/10.5281/zenodo.3596193; https://inderjtaneja.com/2020/01/02/2020-in-numbers-mathematical-style/ Inder J. Taneja, Pythagorean Triples, https://inderjtaneja.com/category/pythagorean-triples/ Inder J. Taneja, Single Digits Representations of Numbers from 1 to 20000, https://inderjtaneja.com/2019/01/01/single-letter-representations-of-numbers-from-1-to-20000/