Numbers n for which (4+n!)/4 is prime.

Terms

a(0) =4a(1) =5a(2) =6a(3) =13a(4) =21a(5) =25a(6) =32a(7) =40a(8) =61a(9) =97a(10) =147a(11) =324a(12) =325a(13) =348a(14) =369a(15) =1290a(16) =1342a(17) =3167a(18) =6612a(19) =8176a(20) =10990