Numbers k such that k![4] - 2 is prime, where k![4] = A007662(k) = quadruple factorial.

Terms

a(0) =4a(1) =5a(2) =7a(3) =9a(4) =11a(5) =15a(6) =21a(7) =25a(8) =29a(9) =49a(10) =79a(11) =87a(12) =95a(13) =125a(14) =133a(15) =153a(16) =157a(17) =185a(18) =201a(19) =217a(20) =223a(21) =289a(22) =323a(23) =469a(24) =533a(25) =567a(26) =821a(27) =1001a(28) =1999a(29) =2523