Numbers k such that (4*10^k - 79)/3 is prime.

Terms

a(0) =2a(1) =3a(2) =8a(3) =11a(4) =20a(5) =24a(6) =32a(7) =33a(8) =60a(9) =86a(10) =162a(11) =410a(12) =816a(13) =1809a(14) =1920a(15) =2499a(16) =2922a(17) =7205a(18) =8238a(19) =15990a(20) =37163a(21) =115668a(22) =141926a(23) =179963