2217122

Appears in sequences

• Palindromes of form k^2 + 1.at n=8A027720
• Both m and its reverse are one more than a square and m does not end in 0.at n=11A066618
• Both k and its reverse are one more than a square.at n=20A124664
• Palindromes of the form b^k + 1 or b^k - 1, with b, k > 1.at n=27A392319