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A020936 Greatest k such that (k-th prime) < (6 times n-th prime). 1
5, 7, 10, 13, 18, 21, 26, 30, 33, 40, 42, 47, 53, 55, 60, 66, 71, 72, 79, 82, 84, 91, 94, 99, 106, 110, 113, 116, 119, 123, 135, 137, 142, 145, 154, 154, 160, 165, 168, 174, 180, 180, 189, 191, 194, 196, 205, 217, 218, 220, 221, 227, 228, 239, 242, 248, 255, 257 (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[#, -1]]&/@(6Prime[Range[60]]) (* Harvey P. Dale, Jun 18 2013 *)

CROSSREFS

Cf. A020900, A020901, A020934-A020940.

Sequence in context: A112251 A089061 A093115 * A025074 A065503 A152001

Adjacent sequences:  A020933 A020934 A020935 * A020937 A020938 A020939

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Henry Bottomley, Nov 13 2000

STATUS

approved

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Last modified March 18 22:11 EDT 2019. Contains 321305 sequences. (Running on oeis4.)