References: Inder J. Taneja. (2019). Single Digit Representations of Natural Numbers From 1 to 5000, Zenodo, January 14, 2019,   http://doi.org/10.5281/zenodo.2538893.Inder J. Taneja. (2019). Single Digit Representations of Numbers From 10001 to 15000, Zenodo, January, 26, 2019, pp. 1-510,   http://doi.org/10.5281/zenodo.2550414.Inder J. Taneja. (2019). Single Digit Representations of Numbers From 15001 to 20000, Zenodo, January, 26, 2019, pp. 1-510,   http://doi.org/10.5281/zenodo.2550440.Inder … Continue reading August 2020 in Numbers: Part 4 – Patterned Single Letter Representations