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A071904
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Odd composite numbers.
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17
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9, 15, 21, 25, 27, 33, 35, 39, 45, 49, 51, 55, 57, 63, 65, 69, 75, 77, 81, 85, 87, 91, 93, 95, 99, 105, 111, 115, 117, 119, 121, 123, 125, 129, 133, 135, 141, 143, 145, 147, 153, 155, 159, 161, 165, 169, 171, 175, 177, 183, 185, 187, 189, 195
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Same as A014076 except for the initial term 1 (which is not a composite number).
Intersection of A002808 and A005408; A000035(a(n))*(1-A010051(a(n))) = 1; A020639(a(n)) = A162022(n). [Reinhard Zumkeller, Oct 10 2011]
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LINKS
| Zak Seidov, Table of n, a(n) for n = 1..1000.
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MATHEMATICA
| Select[Table[n, {n, 9, 300, 2}], !PrimeQ[#]&] (* From Vladimir Joseph Stephan Orlovsky, Apr 16 2011 *)
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PROG
| (Haskell)
a071904 n = a071904_list !! (n-1)
a071904_list = filter odd a002808_list
-- Reinhard Zumkeller, Oct 10 2011
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CROSSREFS
| Cf. A002808.
Sequence in context: A079364 A160666 A039769 * A014076 A067800 A155474
Adjacent sequences: A071901 A071902 A071903 * A071905 A071906 A071907
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KEYWORD
| nice,nonn
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AUTHOR
| Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jun 12 2002
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