Numbers k such that k!/k#-1 is prime, where k# is the primorial function (A034386).

Terms

a(0) =4a(1) =5a(2) =6a(3) =7a(4) =8a(5) =16a(6) =17a(7) =21a(8) =34a(9) =39a(10) =45a(11) =50a(12) =72a(13) =73a(14) =76a(15) =133a(16) =164a(17) =202a(18) =216a(19) =221a(20) =280a(21) =281a(22) =496a(23) =605a(24) =2532a(25) =2967a(26) =3337a(27) =8711a(28) =10977a(29) =13724