A positive integer, if viewed from left to right and right to left is the same, then this number is called a "palindromic number". For example: 1331, 7, 202, 66 are all "palindromic numbers", but 220 is not a "palindromic number". What is the 1997th "palindrome number" among them?
一个正整数，如果从左到右看和从右到左看都是一样的，那么称这个数为"回文数"．例如：1331，7，202，66都是"回文数"，而220则不是"回文数"．其中第1997个"回文数"是多少．
<result>998_899</result>