northwolves 发表于 2009-12-22 19:55:40

3 hexagons

Place the integers 1 through 28 in the circles of the figure on the left so that each number is used exactly once, the numbers on each edge of each hexagon add to a common sum (there are 15 edges in all), and the numbers at the red corner points are primes.

KeyTo9_Fans 发表于 2009-12-22 21:49:58

有6个解，这是其中1个：



其余5个是经过镜面对称和旋转得到的，本质上是一样的解。

geslon 发表于 2009-12-22 22:34:46

Key版主反应太快了。
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