4015168

Appears in sequences

• a(n) = prime(prime(prime(prime(prime(A028815(n) - 1) - 1) - 1) - 1) - 1) - 1.at n=22A141130
• Eight white queens and one red queen on a 3 X 3 chessboard. G.f.: (1 - 2*x)/(1 - 6*x + 2*x^2).at n=9A180034