Numbers k such that (2*10^k - 143)/3 is prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =9a(4) =12a(5) =19a(6) =48a(7) =54a(8) =90a(9) =97a(10) =104a(11) =174a(12) =349a(13) =385a(14) =1020a(15) =1294a(16) =1737a(17) =2430a(18) =9040a(19) =14173a(20) =15604a(21) =17943a(22) =37447a(23) =149803a(24) =164043