353423domain: NAppears in sequencesNumbers k such that k^3 divides 13^(k^2) + 1.at n=5A177813Array read by upwards antidiagonals: A(n, k) = index of prime(k)^n in A098550.at n=47A253609Numbers k such that k^2 divides 13^k + 1.at n=5A292338