Numbers k such that k!!!! - 1 is prime.

Terms

a(0) =3a(1) =4a(2) =6a(3) =8a(4) =12a(5) =16a(6) =22a(7) =24a(8) =54a(9) =56a(10) =98a(11) =152a(12) =156a(13) =176a(14) =256a(15) =454a(16) =460a(17) =720a(18) =750a(19) =770a(20) =800a(21) =1442a(22) =2846a(23) =5920a(24) =7066a(25) =12778a(26) =19978a(27) =22726a(28) =25938a(29) =27780