Numbers k such that k![4] - 8 is prime, where k![4] = A007662(k) = quadruple factorial.

Terms

a(0) =7a(1) =9a(2) =11a(3) =13a(4) =15a(5) =19a(6) =21a(7) =23a(8) =29a(9) =35a(10) =37a(11) =55a(12) =57a(13) =77a(14) =85a(15) =139a(16) =243a(17) =251a(18) =433a(19) =667a(20) =671a(21) =895a(22) =2127a(23) =2263a(24) =2293a(25) =2645a(26) =2733a(27) =2845a(28) =3675a(29) =4381