68925domain: NAppears in sequencesa(n) = n^3 + 4.at n=41A274077Numbers k such that A(k+1) = A(k) + 3, where A() = A005100() are the deficient numbers.at n=25A317046Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986).at n=11A323851