Greatest k such that (k-th prime) < (7 times n-th prime).

Terms

a(0) =6a(1) =8a(2) =11a(3) =15a(4) =21a(5) =24a(6) =30a(7) =32a(8) =37a(9) =46a(10) =47a(11) =55a(12) =61a(13) =62a(14) =66a(15) =73a(16) =80a(17) =82a(18) =91a(19) =94a(20) =97a(21) =101a(22) =106a(23) =114a(24) =123a(25) =126a(26) =128a(27) =132a(28) =135a(29) =138