约瑟夫环，设有n个人围坐在一个圆桌周围，现从第s个人开始报数，数到第m的人出列，然后从出列的下一个人重新开始报数，数到第m的人又出列，…，如此反复直到所有的人全部出列为止。以n=8，s=1，m=4为例，若初始的顺序为 n1，n2，n3，n4，n5，n6，n7，n8。则问题的解为n4，n8，n5，n2，n1，n3，n7，n6。-Joseph Wan, with n individuals sitting around a round table, is reported starting from the number of individuals s, m the number of people to the column and the column from the next person to start reporting the number of numbers to m, who has a column, ..., and so forth until all the people all of the column so far. To n = 8, s = 1, m = 4, for example, if the initial order of n1, n2, n3, n4, n5, n6, n7, n8. The solution of the problem n4, n8, n5, n2, n1, n3, n7, n6.