278592

Appears in sequences

• A(x) satisfies A005408(x) = A(x)/A(x^2), A005408 = odd numbers.at n=36A173283
• Nonunitary doubly superperfect numbers: numbers k such that nusigma(nusigma(k)) = 2*k, where nusigma(k) = sigma(k) - usigma(k) is the sum of nonunitary divisors of k (A048146).at n=5A329881