Greatest k such that (k-th prime) < (9 times n-th prime).

Terms

a(0) =7a(1) =9a(2) =14a(3) =18a(4) =25a(5) =30a(6) =36a(7) =39a(8) =46a(9) =55a(10) =59a(11) =67a(12) =73a(13) =76a(14) =82a(15) =91a(16) =99a(17) =101a(18) =110a(19) =115a(20) =119a(21) =127a(22) =132a(23) =139a(24) =150a(25) =155a(26) =157a(27) =162a(28) =165a(29) =170