5597955domain: NAppears in sequencesPalindromes of form k*(k+2); or palindromes 1 less than a square.at n=14A028504Both n and its reverse are one less than a square.at n=14A066619Both k and its reverse are one less than a square.at n=29A287389Palindromes of the form b^k + 1 or b^k - 1, with b, k > 1.at n=31A392319