我国古代有一种回文诗,倒念顺念都有意思,例如“人过大佛寺”,倒读起来便是“寺佛大过人”,此种例子举不胜举。在自然数中也有类似情形,比如1991就是一个很特殊的四位数,从左向右读与从右向左读是完全一样的,这样的数称为“回文数”。 人们借助电子计算机发现,在完全平方数、 There is a kind of palindrome in ancient China, and there are meanings to go back to it. For example, if people go to the Great Buddha Temple, it is “the Buddha of the temple is overwhelming”. This example is not exhaustive. There are also similar situations in natural numbers. For example, 1991 is a very special four-digit number. Reading from left to right is exactly the same as reading from right to left. This number is called the number of palindromes. People discover with the help of an electronic computer that the total number of squares,