Integers k such that 3*k!!! + 1 is prime where k!!! is A007661(k).

Terms

a(0) =2a(1) =4a(2) =5a(3) =8a(4) =9a(5) =15a(6) =16a(7) =23a(8) =27a(9) =32a(10) =34a(11) =35a(12) =38a(13) =40a(14) =46a(15) =54a(16) =57a(17) =83a(18) =87a(19) =97a(20) =162a(21) =165a(22) =223a(23) =235a(24) =282a(25) =488a(26) =503a(27) =575a(28) =673a(29) =823