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Search: id:A076827
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| A076827 |
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Number of odd terms minus number of even terms in the set S(n) = ( A002977(k) : k<=n). |
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+0
1
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| 1, 2, 1, 2, 3, 2, 3, 4, 5, 6, 5, 6, 5, 6, 7, 6, 7, 8, 7, 8, 9, 8, 9, 8, 9, 10, 11, 10, 11, 12, 13, 14, 13, 14, 15, 16, 15, 16, 17, 18, 17, 18, 17, 18, 19, 20, 21, 20, 21, 20, 21, 22, 23, 24, 23, 24, 23, 24, 25, 26, 27, 26, 27, 26, 27, 28, 27, 28, 29, 28, 29, 30, 29, 30, 29, 30, 31
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=(-1)*sum(k=1, n, (-1)^ A002977(k) ); a(n) > 0 and a(n) seems asymptotic to c*n where c = 0.4...
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EXAMPLE
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S(12)=(1,3,4,7,9,10,13,15,19,21,22,27) there are 9 odd terms and 3 even terms in S(12), hence a(12)=9-3=6
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CROSSREFS
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Sequence in context: A070086 A036576 A127255 this_sequence A119994 A029167 A108380
Adjacent sequences: A076824 A076825 A076826 this_sequence A076828 A076829 A076830
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 20 2002
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