640343

Appears in sequences

• Numbers k such that k | 10^k + 1.at n=23A015958
• Numbers k that divide 7^k + 4^k.at n=22A045592
• Numbers k such that k^3 divides 10^(k^2) + 1.at n=9A128683
• 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=19A228440
• Numbers k such that k^2 divides 10^k + 1.at n=7A292335