Greatest k such that (k-th prime) < (5 times n-th prime).

Terms

a(0) =4a(1) =6a(2) =9a(3) =11a(4) =16a(5) =18a(6) =23a(7) =24a(8) =30a(9) =34a(10) =36a(11) =42a(12) =46a(13) =47a(14) =51a(15) =56a(16) =62a(17) =62a(18) =67a(19) =71a(20) =72a(21) =77a(22) =80a(23) =86a(24) =92a(25) =96a(26) =97a(27) =99a(28) =100a(29) =103