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A144972
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Power-6-free numbers.
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0
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Superset of A005117 and A067259. The first numbers not in the sequence are 64, 128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 729 etc. [From R. J. Mathar, Oct 11 2008]
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FORMULA
| {n: A051903(n) <= 5}. [From R. J. Mathar, Oct 11 2008, corrected Oct 19 2008]
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MATHEMATICA
| lst={}; Do[a=0; Do[If[FactorInteger[m][[n, 2]]>5, a=1], {n, Length[FactorInteger[m]]}]; If[a!=1, AppendTo[lst, m]], {m, 2*5!}]; lst
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CROSSREFS
| Sequence in context: A130696 A146297 * A166719 A085736 A055643 A122079
Adjacent sequences: A144969 A144970 A144971 * A144973 A144974 A144975
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KEYWORD
| nonn
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 27 2008
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EXTENSIONS
| Inverted inequality in the formula. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 19 2008
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