A bracelet is made by connecting at least three numbered beads in a circle. Each bead can only display
In addition a magic bracelet must satisfy the following two conditions:
no two beads display the same number
the product of the numbers of any two adjacent beads is of the form
Define the potency of a magic bracelet to be the sum of numbers on its beads. The example is a magic bracelet with five beads which has a potency of 155.
Let
Find
一个数镯由至少三个标有数字的珠子和连接它们的环构成。数镯上的珠子的标号只能是
进一步,定义魔法数镯为满足以下条件的数镯:
数镯上的珠子的标号两两不同。
任意两个相邻珠子上的标号之积均可被表示为
对任意魔法数镯,定义其魔法效力为其所有珠子标号之和。上图中的魔法数镯共有 5 个珠子,魔法效力为 155。
记
求
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