1812384

Appears in sequences

• Numbers n such that sigma(n) = 13*phi(n) (where sigma=A000203, phi=A000010).at n=29A171258
• Triangle read by rows: T(n,k) is the number of endofunctions on [n] whose second-smallest component has size exactly k; n >= 0, 0 <= k <= max(0,n-1).at n=35A350079
• Irregular triangle read by rows: T(n,k) is the number of endofunctions on [n] whose fourth-smallest component has size exactly k; n >= 0, 0 <= k <= max(0,n-3).at n=30A350276