⟳ Репост от Eric Agol
Today Sept 27, 2025. It marks a special mathematical date because the numerals of the date form perfect squares. Written as 09/27/2025, it becomes 9,272,025, which is the square of 3,045. When written in the European format 27/09/2025, it becomes 27,092,025, the square of 5,205.