Numbers k such that k!6 + 18 is prime, where k!6 is the sextuple factorial number (A085158 ).

Terms

a(0) =1a(1) =5a(2) =11a(3) =13a(4) =17a(5) =19a(6) =23a(7) =31a(8) =37a(9) =41a(10) =49a(11) =83a(12) =115a(13) =161a(14) =205a(15) =617a(16) =683a(17) =769a(18) =799a(19) =1117a(20) =1151a(21) =1685a(22) =1697a(23) =1951a(24) =2173a(25) =3619a(26) =3647a(27) =6229a(28) =6463a(29) =6613