653400

Appears in sequences

• a(n) = 18n^3 + 6n^2.at n=33A087887
• Prime power perfect numbers: If n = Product p_i^r_i let PPsigma(n) = Product {Sum p_i^s_i, 2<=s_i<=r_i, s_i is prime}; sequence gives numbers k such that PPsigma(k) = 2*k.at n=16A096290
• E.g.f. (1+x)^(x+x^2).at n=11A191353
• a(n) is the least exponential deficient number that has exactly n exponential abundant divisors.at n=7A389300