5053505domain: NAppears in sequencesPalindromes of form k^2 + 1.at n=9A027720Both m and its reverse are one more than a square and m does not end in 0.at n=13A066618Both k and its reverse are one more than a square.at n=22A124664Palindromes of the form b^k + 1 or b^k - 1, with b, k > 1.at n=30A392319