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Search: id:A158772
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| 21, 21, 21, 42, 42, 42, 84, 84, 84, 168, 168, 168, 336, 336, 336, 672, 672, 672, 1344, 1344, 1344, 2688, 2688, 2688, 5376, 5376, 5376, 10752, 10752, 10752, 21504, 21504, 21504, 43008, 43008, 43008, 86016, 86016, 86016, 172032, 172032, 172032, 344064
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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a(n) divided by 21 is the sequence 1,1,1,2,2,2,4,4,4,.., that is A000079 triplicated.
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CROSSREFS
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Sequence in context: A004462 A154352 A010860 this_sequence A144415 A040421 A022355
Adjacent sequences: A158769 A158770 A158771 this_sequence A158773 A158774 A158775
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KEYWORD
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nonn,less
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Mar 26 2009
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 17 2009
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