Better solution.

送交者: 零加一中 2013月01月02日11:10:28 于 [灵机一动] 发送悄悄话

回  答: I cannot type Chinese with new 由 零加一中 于 2013-01-02 10:37:34

1, 3, 9, ..., 3^(n-1) to weigh up to 1, 4, 13, ..., (3^n - 1) / 2

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This should be the optimized - 零加一中 01/02/13 (15117)

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