53035domain: NAppears in sequencesNontrivial palindromes k such that phi(k) is also a palindrome.at n=4A067723Numbers n such that phi(reversal(n)) = reversal(phi(n)). Ignore leading 0's.at n=22A069282Numbers n such that n and phi(n) are both palindromes.at n=13A069747Palindromic primes in base 6 (written in base 6).at n=25A117701