Composite numbers k such that k!/k# + 1 is prime, where k# = primorial numbers A034386.

Terms

a(0) =4a(1) =8a(2) =14a(3) =20a(4) =26a(5) =34a(6) =56a(7) =104a(8) =153a(9) =182a(10) =194a(11) =217a(12) =230a(13) =280a(14) =462a(15) =529a(16) =1445a(17) =2515a(18) =3692a(19) =6187a(20) =6851a(21) =13917a(22) =17258a(23) =48934a(24) =83515a(25) =96835a(26) =250224a(27) =751882