文件名称:素数幻方
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求四阶的素数幻方。即在一个4X4 的矩阵中，每一个格填 入一个数字，使每一行、每一列和两条对角线上的4 个数字所组成的四位数，均为可逆素数。
-for four bands in several magic squares. In a 4x4 matrix, each one filled a digital grid so that each line, each diagonal out and two on the four figures of the four-digit, are reversible primes.
-for four bands in several magic squares. In a 4x4 matrix, each one filled a digital grid so that each line, each diagonal out and two on the four figures of the four-digit, are reversible primes.
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