A020938 Greatest k such that (k-th prime) < (8 times n-th prime).

6, 9, 12, 16, 23, 27, 32, 36, 42, 50, 53, 62, 66, 68, 74, 82, 91, 93, 99, 103, 106, 115, 121, 127, 137, 139, 143, 147, 150, 154, 170, 175, 183, 186, 195, 197, 204, 213, 217, 221, 226, 229, 241, 243, 248, 250, 263, 276, 280, 282, 284, 292, 293, 304, 310, 317

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

PrimePi[NextPrime[8#,-1]]&/@Prime[Range[60]] (* Harvey P. Dale, May 07 2021 *)

Extensions

More terms from Henry Bottomley, Nov 13 2000