This paper uses n nature numbers from 1 to n to form a numerical table of twofold maoic square' s necessary condition. It also proves that x>n(n-1) and the numerical table is the sufficient condition of the basic solution.
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章长才.双重幻方的一个充分条件[J].土木与环境工程学报(中英文),1993,15(4). Zhang Changcai. A SUFFICIENT CONDITION OF TWOFOLD MAGIC SQUARE[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,1993,15(4).10.11835/j. issn.1674-4764.1993.04.019