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Search: id:A093152
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| A093152 |
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Number of odd composites 3 mod 4 less than 10^n. |
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+0
3
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| 0, 12, 163, 1881, 20192, 210678, 2167602, 22119050, 224575958, 2272470765, 22940965468, 231196012323, 2326967172345, 23397529032871, 235077714312816, 2360380827753871, 23688221418030854, 237630022854838725
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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Count odd composites 3 mod 4 less than 10^n
For n>1, a(n) = 25*10^(n-2) - A091099(n) [From Max Alekseyev (maxale(AT)gmail.com), May 17 2009]
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EXAMPLE
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Below 10^2 there are 12 odd composites 3 mod 4 so a(2)=12
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CROSSREFS
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Cf. A093151 A093153 A091295 A091098 A091099.
Sequence in context: A109391 A138455 A024221 this_sequence A143583 A046174 A055760
Adjacent sequences: A093149 A093150 A093151 this_sequence A093153 A093154 A093155
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Mar 24 2004
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EXTENSIONS
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a(9) from Ryan Propper (rpropper(AT)stanford.edu), Jun 21 2005
Extended by Max Alekseyev (maxale(AT)gmail.com), May 17 2009
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