Numbers k such that A007923(k) is prime.

Terms

a(0) =2a(1) =7a(2) =8a(3) =10a(4) =17a(5) =20a(6) =25a(7) =28a(8) =31a(9) =38a(10) =61a(11) =62a(12) =355a(13) =4690a(14) =4772a(15) =8162a(16) =10523a(17) =14716a(18) =32114a(19) =117712