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A020939 Greatest k such that (k-th prime) < (9 times n-th prime). 1
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 (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

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

CROSSREFS

Cf. A020900, A020901, A020934-A020940.

Sequence in context: A004472 A145827 A116025 * A282758 A073457 A067873

Adjacent sequences:  A020936 A020937 A020938 * A020940 A020941 A020942

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Henry Bottomley, Nov 13 2000

STATUS

approved

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Last modified February 19 10:58 EST 2018. Contains 299330 sequences. (Running on oeis4.)