321468

Appears in sequences

• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x + 97)^2 = y^2.at n=14A129836
• a(n) = 441*n^2 - 21.at n=26A145678
• Numbers n such that sigma(n) = 10*phi(n) (where sigma=A000203, phi=A000010).at n=25A171256