Numbers k such that k! - (k-1)! - 1 is prime.

Terms

a(0) =3a(1) =4a(2) =6a(3) =8a(4) =9a(5) =12a(6) =28a(7) =78a(8) =99a(9) =184a(10) =286a(11) =291a(12) =398a(13) =411a(14) =600a(15) =718a(16) =732a(17) =889a(18) =1963a(19) =2240a(20) =2242a(21) =2533a(22) =8800a(23) =11403a(24) =18335a(25) =20277a(26) =21029