A020938 - OEIS

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A020938

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

1

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

MATHEMATICA

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

CROSSREFS

Cf. A020900, A020901, A020934-A020940.

Sequence in context: A023040 A001474 A084806 * A136360 A023483 A023042

Adjacent sequences: A020935 A020936 A020937 * A020939 A020940 A020941

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Henry Bottomley, Nov 13 2000

STATUS

approved