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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
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
Sequence in context: A026602 A287436 A103078 * A075347 A352506 A005733
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 March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)