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A020935 Greatest k such that (k-th prime) < (5 times n-th prime). 1
4, 6, 9, 11, 16, 18, 23, 24, 30, 34, 36, 42, 46, 47, 51, 56, 62, 62, 67, 71, 72, 77, 80, 86, 92, 96, 97, 99, 100, 103, 115, 119, 124, 125, 132, 133, 137, 141, 145, 150, 154, 154, 162, 162, 166, 167, 177, 186, 189, 189, 192, 196, 197, 204, 208, 214, 217, 217, 221 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..59.

PROG

(PARI) a(n) = primepi(5*prime(n)) \\ Michel Marcus, May 13 2013

CROSSREFS

Cf. A020900, A020901, A020934-A020940.

Sequence in context: A047209 A138812 A003259 * A267149 A198696 A219612

Adjacent sequences:  A020932 A020933 A020934 * A020936 A020937 A020938

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Henry Bottomley, Nov 13 2000

STATUS

approved

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Last modified March 21 20:35 EDT 2019. Contains 321382 sequences. (Running on oeis4.)