Numbers k such that (197*10^k - 11)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =11a(4) =24a(5) =49a(6) =50a(7) =59a(8) =67a(9) =71a(10) =91a(11) =605a(12) =726a(13) =899a(14) =1214a(15) =3307a(16) =3409a(17) =3961a(18) =11426a(19) =30096a(20) =70241a(21) =80089a(22) =108446