Numbers k such that (14*10^k - 71) / 3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =10a(6) =14a(7) =22a(8) =25a(9) =31a(10) =43a(11) =63a(12) =123a(13) =430a(14) =508a(15) =1457a(16) =1701a(17) =3371a(18) =3429a(19) =3548a(20) =4582a(21) =7463a(22) =8852a(23) =10594a(24) =30621a(25) =143662