#### 90th Day of Year: 31.03.22 – Sigle Digits Representations

References: Inder J. Taneja, Single Digit Representations of Natural Numbers From 1 to 5000, Zenodo, , January 14, 2019, https://doi.org/10.5281/zenodo.2538893. Inder J. Taneja, Single Digit Representations of Natural Numbers From 5001 to…