n! - n# - 1 is prime, where n# is the primorial function.

Terms

a(0) =4a(1) =5a(2) =20a(3) =92a(4) =106a(5) =266a(6) =308a(7) =343a(8) =583a(9) =597a(10) =903a(11) =1021a(12) =1239a(13) =1314a(14) =2458a(15) =6160a(16) =9627a(17) =10649