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

Terms

a(0) =4a(1) =6a(2) =8a(3) =16a(4) =21a(5) =34a(6) =39a(7) =45a(8) =50a(9) =72a(10) =76a(11) =133a(12) =164a(13) =202a(14) =216a(15) =221a(16) =280a(17) =496a(18) =605a(19) =2532a(20) =2967a(21) =3337a(22) =8711a(23) =10977a(24) =13724a(25) =15250a(26) =18160a(27) =20943a(28) =33684a(29) =41400