Numbers k such that 4*10^k+9 is prime.

Terms

a(0) =0a(1) =2a(2) =4a(3) =5a(4) =8a(5) =9a(6) =28a(7) =191a(8) =196a(9) =2038a(10) =34414a(11) =39266a(12) =50579a(13) =94286a(14) =108412a(15) =130480a(16) =178091a(17) =185355