Numbers k such that (k!-9)/9 is prime.

Terms

a(0) =6a(1) =15a(2) =17a(3) =18a(4) =21a(5) =27a(6) =29a(7) =30a(8) =37a(9) =47a(10) =50a(11) =64a(12) =125a(13) =251a(14) =602a(15) =611a(16) =1184a(17) =1468a(18) =5570a(19) =10679a(20) =15798a(21) =21237