Numbers k such that (17*10^k + 31)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =6a(4) =8a(5) =12a(6) =13a(7) =14a(8) =19a(9) =61a(10) =127a(11) =137a(12) =173a(13) =175a(14) =305a(15) =540a(16) =617a(17) =935a(18) =1398a(19) =1834a(20) =3295a(21) =4351a(22) =9188a(23) =10808a(24) =39409a(25) =57325a(26) =63798a(27) =67091a(28) =183764a(29) =194502