Smallest prime >= n!.

Terms

a(0) =2a(1) =2a(2) =2a(3) =7a(4) =29a(5) =127a(6) =727a(7) =5051a(8) =40343a(9) =362897a(10) =3628811a(11) =39916801a(12) =479001629a(13) =6227020867a(14) =87178291219