Turn the year 1961 upside down and it looks the same. When was the last similar year before 1961?

题目

Turn the year 1961 upside down and it looks the same. When was the last similar year before 1961?

答案

问题是：
将1961年的数字倒过来,基本一样.前面还有一个和这个一样的年是哪一年?
答案是1691年,倒过来也是1691.