151290domain: NAppears in sequencesa(n) = A006551(n) - A018224(n).at n=8A154413Numbers A055744(n) such that for any k < n, A055744(k) and A055744(n) do not have all their prime factors in common.at n=32A256431If the decimal expansion of n is d_1 ... d_k, a(n) = Sum d_i!*binomial(10,d_i).at n=26A306958