Numbers k such that 8^k starts with k.

Terms

a(0) =4a(1) =10a(2) =18a(3) =652a(4) =1299a(5) =8225a(6) =12949a(7) =56230a(8) =156277a(9) =3227298a(10) =144225157a(11) =316850589680a(12) =359895233752