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

%I #6 Jan 10 2013 17:22:11

%S 7,9,14,18,25,30,36,39,46,55,59,67,73,76,82,91,99,101,110,115,119,127,

%T 132,139,150,155,157,162,165,170,189,193,202,204,217,217,223,232,239,

%U 245,254,258,267,270,274,278,290,304,309,310,316,324,326,335,344,350

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

%H Harvey P. Dale, <a href="/A020939/b020939.txt">Table of n, a(n) for n = 1..1000</a>

%t Table[PrimePi[NextPrime[9*Prime[n],-1]],{n,60}] (* _Harvey P. Dale_, Jan 10 2013 *)

%Y Cf. A020900, A020901, A020934-A020940.

%K nonn

%O 1,1

%A _Clark Kimberling_

%E More terms from _Henry Bottomley_, Nov 13 2000

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Last modified March 19 04:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)