599500

Appears in sequences

• a(n) = n*(n-1)^3*(n^2-n-1)/2.at n=11A101384
• Number x such that usigma(x) = (-1)sigma(x), where usigma(x) is the sum of unitary divisors of x (A034448) and (-1)sigma(x) is defined in A049060 .at n=17A258101