周期答案：

　　觀察數(shù)列發(fā)現(xiàn)，除前兩個(gè)數(shù)字之外，7,1,2,5,4,3六個(gè)數(shù)字周期出現(xiàn)，因?yàn)?img alt="" src="data:image/png;base64,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" /> ，所以第2008個(gè)數(shù)是1。