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大约成书于公元34世纪的《孙子算经》是我国古代的一部优秀教学著作．其中卷下第26题为“物不知数”：“今有物，不知其数，三三数之，剩二；五五数之，剩三；七七数之，剩二．问物几何．”此问题用现代数论符号表示，即为求一个最小的正整数N，使得‘6同时满足一次同余式组《
The book about the grandson’s calculations written about the 34th century AD is an excellent teaching book in ancient China. Among them, the 26th volume under the title “Impaired things”: “There are objects, I do not know the number, three or three of the number, leaving two; five five of the number, leaving three; seventy-seven of the number of two. Geometric geometry. ”This problem is expressed in terms of modern number theory, that is, to find a smallest positive integer N, so that ’6 simultaneously meets a congruence group’."