148728578

Appears in sequences

• Numbers n such that usigma(usigma(n))/usigma(n) > usigma(usigma(m))/usigma(m) for all m < n, where usigma(n) is the sum of unitary divisors of n (A034448).at n=9A289126
• a(n) is the smallest number k such that psi(k) = A001615(k) is the product of n distinct primes.at n=8A291144
• a(n) is the smallest k such that usigma(k) = A002110(n), or 0 if no such k exists.at n=9A291356