Numbers k such that 4*k! - 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =6a(6) =10a(7) =11a(8) =51a(9) =63a(10) =197a(11) =313a(12) =579a(13) =1264a(14) =2276a(15) =2669a(16) =4316a(17) =4382a(18) =4678a(19) =7907a(20) =10843