164989440

Appears in sequences

• Numbers k for which sigma(k)/k - 4/7 is an integer.at n=7A218411
• Harmonic numbers k such that the harmonic mean of the divisors of k is also a harmonic number.at n=2A317476
• 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=17A325021
• Refactorable numbers (A033950) that are simultaneously arithmetic (A003601) and harmonic (A001599).at n=5A331666
• Harmonic numbers (A001599) with a record harmonic mean of divisors.at n=28A335316
• Harmonic numbers (A001599) with a record number of divisors.at n=17A335317
• a(n) is the smallest number with exactly n divisors d such that sigma(d)/d is an integer.at n=8A338405
• Numbers k such that A380845(k) > 4*k.at n=24A380931