263928

Appears in sequences

• Numbers n such that sigma(phi(n))-phi(n) = phi(sigma(n)-n).at n=16A132793
• Partial sums of A001580.at n=17A174121
• Triangle read by rows: T(n,k) is the number of ways to place k non-attacking kings in each row of an n X n board, 0 <= k <= floor((n+1)/4) + [n=1].at n=30A390419
• Number of n X n grids with 3 non-attacking kings on each row.at n=12A390736