1438811

Appears in sequences

• Positive integers k such that k divides 12^k - 1.at n=20A014951
• Numbers k such that k | 10^k + 1.at n=28A015958
• Numbers k that divide 6^k + 5^k.at n=30A045595
• Numbers n dividing u(n), where the Lucas sequence is defined u(i) = u(i-1) - 3*u(i-2) with initial conditions u(0)=0, u(1)=1.at n=23A228440
• Numbers k such that sigma_2(k) = sigma_2(phi(k)).at n=5A333338