MathDB
We can divide weights to 3 groups [Germany BW 2000]

Source:

February 3, 2011
combinatorics proposedcombinatorics

Problem Statement

We are given n≥3n \geq 3 weights of masses 1,2,3,…,n1, 2, 3, \ldots , n grams. Find all nn for which it is possible to divide these weights into three groups with the same mass.
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