3191760

Appears in sequences

• Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=4A203915
• Number of (n+2)X7 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order.at n=4A203920
• Denominators of the partial sums of the reciprocals of the unitary totient function (A047994).at n=31A379518
• Denominators of the partial sums of the reciprocals of the unitary totient function (A047994).at n=32A379518