# 21st Day of the Year 21st of the 21st Century: Magic Square of Order 21 With Magic Sum 21

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, Block-Wise and Block-Bordered Magic and Bimagic Squares With Magic Sums 21, 21^2 and 2021, https://inderjtaneja.com/2020/12/20/block-wise-and-block-bordered-magic-and-bimagic-squares-with-magic-sums-21-212-and-2021/
3. Inder J. Taneja, Fractional and Decimal Type Bordered Magic Squares With Magic Sum 2021,  https://inderjtaneja.com/2020/12/18/fractional-and-decimal-type-bordered-magic-squares-with-magic-sum-2021/ . Also refers:

4. Inder J. Taneja, Block-Bordered Magic Squares of Prime and Double Prime Orders: I, II and III,  https://inderjtaneja.com/2020/10/08/block-bordered-magic-squares-of-prime-and-double-prime-orders-i-ii-and-iii/. Also refers:

5. Inder J. Taneja, Bordered Magic Squares With Order Square Magic Sums,  https://inderjtaneja.com/2020/01/21/bordered-magic-squares-with-order-square-magic-sums/.

6. Inder J. Taneja, Block-Wise Construction of Magic and Bimagic Squares of Orders 12 to 24,  https://inderjtaneja.com/2018/01/10/block-wise-magic-and-bimagic-squares-part-i/. Also refers:

7. 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/

8.Inder J. Taneja, Factorial-Type Numerical Calender 2021, Zenodo, December 16, 2020, pp. 1-31,  http://doi.org/10.5281/zenodo.4329889