Numbers k such that 4*10^k - 57 is prime.

Terms

a(0) =3a(1) =7a(2) =10a(3) =15a(4) =28a(5) =35a(6) =70a(7) =183a(8) =243a(9) =298a(10) =366a(11) =388a(12) =607a(13) =791a(14) =827a(15) =1704a(16) =1732a(17) =1743a(18) =2755a(19) =2766a(20) =2983a(21) =3312a(22) =7173a(23) =16365a(24) =18234a(25) =102163a(26) =104461a(27) =136813a(28) =154078