References: Inder J. Taneja, 2020 In Numbers: Mathematical Style – Revised,  Zenodo, December 31, 2019, pp. 1-37, http://doi.org/10.5281/zenodo.3596193. Inder J. Taneja, Fraction-Type Single Letter Representations of Natural Numbers From 1 to 11111, Zenodo, February 4, 2019, pp. 1-203, http://doi.org/10.5281/zenodo.2556902. Inder J. Taneja, Nested Magic Squares With Perfect Square Sums, Pythagorean Triples, and Borders Differences, Zenodo, June 14, … Continue reading 18th Day of Year: 18.01.20