Numbers k such that 4*10^k + 39 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =6a(5) =12a(6) =19a(7) =23a(8) =24a(9) =86a(10) =110a(11) =120a(12) =258a(13) =359a(14) =584a(15) =1144a(16) =2833a(17) =10346a(18) =13333a(19) =23238a(20) =29546a(21) =44356a(22) =59292