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Search: id:A146166
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| A146166 |
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Odd square-free semiprimes. |
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+0
6
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| 15, 21, 33, 35, 39, 51, 55, 57, 65, 69, 77, 85, 87, 91, 93, 95, 111, 115, 119, 123, 129, 133, 141, 143, 145, 155, 159, 161, 177, 183, 185, 187, 201, 203, 205, 209, 213, 215, 217, 219, 221, 235, 237, 247, 249, 253, 259, 265, 267, 287, 291
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Subsequence of A056913. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 29 2008]
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
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MATHEMATICA
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f[n_]:=Last/@FactorInteger[n]=={1, 1}&&FactorInteger[n][[1, 1]]>2; a=6; lst={}; Do[If[f[n], AppendTo[lst, n]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 23 2009]
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CROSSREFS
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A001358 (semiprimes), A046388(Odd numbers with exactly 2 distinct prime factors).
Sequence in context: A046388 A098905 A024556 this_sequence A056913 A002557 A128907
Adjacent sequences: A146163 A146164 A146165 this_sequence A146167 A146168 A146169
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KEYWORD
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nonn,new
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AUTHOR
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W. Bomfim (webonfim(AT)bol.com.br), Oct 27 2008
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