一个数的各位数字倒过来所得到的新数叫原数的反序数. 如果一个数等于它的反序数，则称它为对称数或回文数。 求10000以内的二进制对称数.-The digits of a number of upside down to get a new number called the anti-ordinal number of the original number. If a number is equal to its inverse ordinal number, call it th