write all numbers between 500 to 600 which do not change if the digits are written in the reverse order.
What are the whole numbers between 100 and 200 which do not change if the digits are written in reverse order?
A palindrome is a positive integer which is unchanged if you reverse the order of its digits. If all palindromes are written in increasing order, how many possible prime values can the difference between successive palindromes take?
Write the smallest 5 digit number which does not change when it is reversed.