Numbers n such that primorial(n)/2 - 4 is prime.

Terms

a(0) =3a(1) =4a(2) =5a(3) =7a(4) =12a(5) =15a(6) =26a(7) =31a(8) =50a(9) =71a(10) =186a(11) =273a(12) =366a(13) =1542a(14) =1929a(15) =3687a(16) =4407a(17) =15395a(18) =15433