An example : 923456781-123456789=799999992
Now divide it by the difference between the terminal digits, i.e. 9-1=8
So 799999992/8=99999999
Another example : 52314780-02314785=49999995/5=99999999
But if we do : 799999992/9=88888888 and 49999995/9=5555555
So either the difference or 9 itself help in generating symmetric palindromes
Can this be generalized?
Also refer to Super palindromes and 9 hidden in every number regardless of number of digits?