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A033849
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Numbers n whose prime factors are 3 and 5.
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16
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15, 45, 75, 135, 225, 375, 405, 675, 1125, 1215, 1875, 2025, 3375, 3645, 5625, 6075, 9375, 10125, 10935, 16875, 18225, 28125, 30375, 32805, 46875, 50625, 54675, 84375, 91125, 98415, 140625, 151875, 164025, 234375, 253125, 273375, 295245
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| n such that phi(n)=(8/15)*n - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 19 2002
A143201(a(n))=3; subsequence of A143202; a(n)=15*A003593(n). [Reinhard Zumkeller, Sep 13 2011]
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
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PROG
| (Haskell)
import Data.Set (singleton, deleteFindMin, insert)
a033849 n = a033849_list !! (n-1)
a033849_list = f (singleton (3*5)) where
f s = m : f (insert (3*m) $ insert (5*m) s') where
(m, s') = deleteFindMin s
-- Reinhard Zumkeller, Sep 13 2011
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CROSSREFS
| Cf. A033845, A033846, A033847, A033848, A033850, A033851.
Sequence in context: A084821 A066763 A164788 * A194715 A060536 A014634
Adjacent sequences: A033846 A033847 A033848 * A033850 A033851 A033852
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KEYWORD
| nonn
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AUTHOR
| Jeff Burch (gburch(AT)erols.com)
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EXTENSIONS
| Offset and typo in data fixed by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 13 2011
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