Numbers k such that (5*10^k + 211)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =32a(5) =37a(6) =38a(7) =53a(8) =104a(9) =128a(10) =241a(11) =866a(12) =872a(13) =943a(14) =1058a(15) =4351a(16) =16471a(17) =16925a(18) =23933a(19) =43511a(20) =73079a(21) =105811