A020939 Greatest k such that (k-th prime) < (9 times n-th prime).

7, 9, 14, 18, 25, 30, 36, 39, 46, 55, 59, 67, 73, 76, 82, 91, 99, 101, 110, 115, 119, 127, 132, 139, 150, 155, 157, 162, 165, 170, 189, 193, 202, 204, 217, 217, 223, 232, 239, 245, 254, 258, 267, 270, 274, 278, 290, 304, 309, 310, 316, 324, 326, 335, 344, 350

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A020900, A020901, A020934-A020940.

Programs

Mathematica

Table[PrimePi[NextPrime[9*Prime[n],-1]],{n,60}] (* Harvey P. Dale, Jan 10 2013 *)

Extensions

More terms from Henry Bottomley, Nov 13 2000