1529983

Appears in sequences

• Numbers n such that sigma(n) = 2*phi(n).at n=12A062699
• Numbers n such that sigma(n) = phi(3n).at n=28A074891
• Balanced numbers n such that n mod 12 = 7.at n=3A110599
• a(n) = smallest k having at least five prime divisors d such that (d + n) | (k + n).at n=16A202160