417086670

Appears in sequences

• Products of 9 distinct primes.at n=9A115343
• 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=21A291051
• Numbers k such that omega(k) = 9.at n=9A348073