52141320

Appears in sequences

• Harmonic seed numbers.at n=24A035527
• Numbers k for which sigma(k)/k - 4/9 is an integer.at n=5A218415
• Harmonic numbers m from A001599 such that m*(m-tau(m))/sigma(m) is an integer h, where k-tau(k) is the number of nondivisors of k (A049820), tau(k) is the number of divisors of k (A000005), and sigma(k) is the sum of the divisors of k (A000203).at n=15A325021
• Numbers whose numerator and denominator of the harmonic mean of their divisors are both 3-smooth numbers.at n=33A348867