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A093151
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Number of odd composites 1 mod 4 less than 10^n.
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2
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1, 13, 169, 1890, 20216, 210824, 2167819, 22119495, 224576508, 2272476724, 22940979719, 231196075659, 2326967290816, 23397529216327, 235077715264515, 2360380831212204, 23688221424314913, 237630022857420415, 2382971166402199310, 23889590198849417292
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OFFSET
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1,2
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LINKS
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FORMULA
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Count odd composites 1 mod 4 less than 10^n
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EXAMPLE
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Below 10^2 there are 13 odd composites so a(2)=13
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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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