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4, 6, 9, 20, 28, 30, 42, 44, 45, 52, 63, 66, 68, 76, 78, 92, 99, 100, 102, 114, 116, 117, 124, 138, 140, 148, 150, 153, 164, 171, 172, 174, 186, 188, 196, 207, 210, 212, 220, 222, 225, 236, 244, 246, 258, 260, 261, 268, 279, 282, 284, 292, 294, 308, 315, 316
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The asymptotic density of this sequence is 19/108. - Amiram Eldar, Jan 16 2022
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LINKS
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MATHEMATICA
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f[n_] := Plus @@ Last /@ Select[ FactorInteger@ n, 1 < #[[1]] < 4 &]; Select[ Range@ 317, f@# == 2 &] (* Robert G. Wilson v, Dec 19 2009) (* Extended beyond 150 by R. J. Mathar, Dec 09 2009 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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