394420domain: NAppears in sequencesa(n) = 1 + prime(n) + prime(n)^2 + prime(n)^3.at n=20A131991Number of sets of exactly n positive integers <= 2n having a square element sum.at n=13A281872Totient numbers (A002202) of the form 1 + k + k^2 + k^3 +...+ k^i (i > 1, k > 1).at n=36A282090