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

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =8a(6) =13a(7) =20a(8) =24a(9) =46a(10) =59a(11) =150a(12) =152a(13) =198a(14) =683a(15) =880a(16) =1135a(17) =1907a(18) =6617a(19) =10243a(20) =12016