If you enjoy ৪ being four and ৭ seven you will probably enjoy the thousand-year-old magic square inscribed at the Parshvanatha temple in Madhya Pradesh.
https://blog.plover.com/math/magic-square-puzzle.html
Shreevatsa R. tells me that the digit symbols are probably Nagari, which predates Devanagari.
If you enjoy ৪ being four and ৭ seven you will probably enjoy the thousand-year-old magic square inscribed at the Parshvanatha temple in Madhya Pradesh.
https://blog.plover.com/math/magic-square-puzzle.html
Shreevatsa R. tells me that the digit symbols are probably Nagari, which predates Devanagari.