212541domain: NAppears in sequencesNumbers k such that k^3 divides 5^(k^2) + 1.at n=14A128679G.f.: A(x) = (1 + 21*x + 3*x^2 - x^3)/(1-x)^5.at n=20A183066Numbers k such that k^2 divides 5^k + 1.at n=11A292331