260th and 261st Days of Year: 17.09.2021 and 18.09.2021 – Crazy, Single Letter and Pythagorean Triples Patterns

References:

1. Inder J. Taneja, Colored Patterns With 2021 On a Board of 9×9,  https://inderjtaneja.com/2020/12/26/colored-pattern-with-2021-on-a-board-of-9×9/
2. 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/
3. Inder J. Taneja, Patterns in Pythagorean Triples Using Single and Double Variable Procedures, Zenodo, January 19, 2019, pp. 1-134, http://doi.org/10.5281/zenodo.2544519
4. Inder J. Taneja, Multiple-Type Patterns and Pythagorean Triples, Zenodo, January 19, 2019, pp.1-53,  http://doi.org/10.5281/zenodo.2544527
5. Inder J. Taneja, Palindromic-Type Pandigital Patterns in Pythagorean Triples, Zenodo, January 20, 2019, pp. 1-160,  http://doi.org/10.5281/zenodo.2544551
6. Inder J. Taneja, Generating Pythagorean Triples, Patterns, and Magic Squares, Zenodo, January 20, 2019, pp. 1-121,  http://doi.org/10.5281/zenodo.2544555
7. Inder J. Taneja, Patterns in Pythagorean Triples, Zenodo, March 13, 1-136,  http://doi.org/10.5281/zenodo.4603197
8. Inder J. Taneja, Pandigital-Type and Pythagorean Triples Patterns, Zenodo, March 17, 1-750,  http://doi.org/10.5281/zenodo.4611511
9. Inder J. Taneja, Power-Type Semi-Selfie Numbers and Patterns, Zenodo, July 16, 2019, pp. 1-130,  http://doi.org/10.5281/zenodo.3338366
10. Inder J. Taneja, Patterned Single Letter Representations of Natural Numbers, Zenodo, July 02, 2020, pp. 1-110, http://doi.org/10.5281/zenodo.3928507