103525domain: NAppears in sequencesNumbers k such that k | 4^k + 1.at n=17A015950Numbers k that divide 4^k + 1, k not a power of 5.at n=9A015974Numbers k that divide 8^k + 2^k.at n=38A045581Sides of integer Heronian triangles [A068967(n), prime(A068967(n)), a(n)] with area A068969(n).at n=31A068968