Integers k such that R(k+8) = 4.

Terms

a(0) =32a(1) =392a(2) =3992a(3) =39992a(4) =399992a(5) =3999992a(6) =39999992a(7) =399999992a(8) =3999999992a(9) =39999999992a(10) =399999999992