Numbers k such that (4*10^k - 91)/3 is prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =10a(4) =13a(5) =14a(6) =22a(7) =31a(8) =47a(9) =57a(10) =64a(11) =71a(12) =86a(13) =911a(14) =1012a(15) =1855a(16) =2111a(17) =4920a(18) =5838a(19) =9238a(20) =185221a(21) =292619