1102290

Appears in sequences

• Numbers n such that sigma(n) = 13*phi(n) (where sigma=A000203, phi=A000010).at n=24A171258
• a(n) is the smallest number k such that psi(k) = n*phi(k) where psi(k) is Dedekind psi function (A001615) and phi(k) is Euler totient function (A000010), or 0 if no such k exists.at n=12A291051