# Block-Wise and Block-Bordered Magic and Bimagic Squares of Orders 10 to 47

We know that we can always write block-wise magic squares of any order except for the orders of type p and 2p, where p is a prime number. On the other hand we can always write bordered magic squares of any order. The aims of this work is to combine the both, i.e., bordered and … Continue reading Block-Wise and Block-Bordered Magic and Bimagic Squares of Orders 10 to 47

# 21st Day, 21st Year and 21st Century: Upside-Down Semi-Magic Squares of Order 21 With Digits 2 and 1

Semi-Magic Squares of Order 21 With Digits 2 and 1 Above two magic square are semi-magic squares with locks of orders 3 and 7. The semi-magic sums of semi-magic squares is 35555555552. Instead of semi-magic we can construct magic square also, but in this it will be without blocks. Morever, the above magic squares are … Continue reading 21st Day, 21st Year and 21st Century: Upside-Down Semi-Magic Squares of Order 21 With Digits 2 and 1

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

References: 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/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/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: Inder J. Taneja, Fractional and Decimal Type Bordered Magic Squares With Magic Sum … Continue reading 21st Day of the Year 21st of the 21st Century: Magic Square of Order 21 With Magic Sum 21