Saturday 29 March 2014

Perfect square palindromic numbers

A palindromic number is one which when expressed in base $10$ with no leading zeros, reads the same left to right and right to left. For example, $44944$ is a (base 10) palindrome.



I can find quite a few palindromes which are also perfect squares; indeed there are an infinite set of them of the form $1,121,10201,1002001, \ldots$. In each of these cases, however, the square root of the palindrome is itself a palindrome.



I would like to know about palindromes which are the square of non-palindromes:




  • Are there any perfect square palindromes whose square roots are not palindromic?


  • Is there an infinite set of perfect square palindromes whose square roots are not palindromic?



  • Are the answers to these questions different in other bases?


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