Greatest k such that (k-th prime) < (8 times n-th prime).

Terms

a(0) =6a(1) =9a(2) =12a(3) =16a(4) =23a(5) =27a(6) =32a(7) =36a(8) =42a(9) =50a(10) =53a(11) =62a(12) =66a(13) =68a(14) =74a(15) =82a(16) =91a(17) =93a(18) =99a(19) =103a(20) =106a(21) =115a(22) =121a(23) =127a(24) =137a(25) =139a(26) =143a(27) =147a(28) =150a(29) =154