2217121

Appears in sequences

• Squares resulting from procedure described in A048383.at n=20A048384
• Squares composed of digits {1,2,7}.at n=2A053885
• Perfect powers using only prime digits and 1.at n=29A083806
• The smallest square referenced in A280547 (Smallest number k such that (k+1)^n - k^n is divisible by a square > 1).at n=29A281996