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

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =10a(9) =17a(10) =25a(11) =28a(12) =31a(13) =37a(14) =38a(15) =39a(16) =46a(17) =47a(18) =49a(19) =55a(20) =67a(21) =82a(22) =85a(23) =94a(24) =98a(25) =115a(26) =120a(27) =129a(28) =167a(29) =214