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Search: id:A134229
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| A134229 |
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Sum of the odd composites A071904 less than or equal to 1+2*10^n. |
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+0
3
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| 45, 5975, 724952, 78848811, 8290599189, 857088171080, 87727442181950, 8924793000002668
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A134228(n) + a(n) = A134230(n).
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FORMULA
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Beginning with 3, compute 10^n sums of odd composites.
a(n)=sum{A071904(i): A071904(i) <= 1+2*10^n}. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 28 2007
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EXAMPLE
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a(1)=45 because that is the sum of the odd composites (9+15+21)=45) under 10^1 (beginning with 3).
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CROSSREFS
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Cf. A134228 A134230.
Sequence in context: A101291 A061542 A037182 this_sequence A163035 A101994 A007537
Adjacent sequences: A134226 A134227 A134228 this_sequence A134230 A134231 A134232
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KEYWORD
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more,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Oct 14 2007
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EXTENSIONS
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Better definition from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 28 2007
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