Mathematical problem
The hexagonal tortoise problem (Korean: ; Hanja: ; RR: ) was invented by Korean aristocrat and mathematician Choi Seok-jeong (1646–1715). It is a mathematical problem that involves a hexagonal lattice, like the hexagonal pattern on some tortoises' shells, to the ("N") vertices of which must be assigned integers (from 1 to "N") in such a way that the sum of all integers at the vertices of each hexagon is the same. The problem has apparent similarities to a magic square although it is a vertex-magic format rather than an edge-magic form or the more typical rows-of-cells form.
His book, "Gusuryak", contains many mathematical discoveries.
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