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A060756 a(n) is the smallest number for which exactly n primes are bounded between a(n) and 2a(n) exclusively. 12
1, 2, 4, 9, 10, 16, 22, 27, 34, 36, 40, 51, 52, 55, 57, 70, 82, 87, 91, 96, 99, 100, 120, 121, 126, 135, 136, 142, 147, 159, 175, 177, 187, 190, 205, 210, 216, 217, 220, 222, 232, 246, 250, 255, 262, 289, 297, 300, 301, 304, 309, 310, 324, 327, 330, 339, 342 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) is the first occurrence of n in A060715.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

EXAMPLE

a(10)=40 since ten primes,namely,41,43,47,53,59,61,67,71,73,79,first arise between 40 and its double.

PROG

(Haskell)

import Data.List (elemIndex)

import Data.Maybe (mapMaybe)

a060756 n = a060756_list !! n

a060756_list = map (+ 1) $ mapMaybe (`elemIndex` a060715_list) [0..]

-- Reinhard Zumkeller, Jan 05 2012

CROSSREFS

Cf. A060715, A059316, A080359.

Sequence in context: A026602 A287436 A103078 * A075347 A352506 A005733

Adjacent sequences: A060753 A060754 A060755 * A060757 A060758 A060759

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, Apr 23 2001

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), Jun 05 2001

STATUS

approved

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Last modified April 1 09:50 EDT 2023. Contains 361688 sequences. (Running on oeis4.)