A093152 - OEIS

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A093152

Number of odd composites 3 mod 4 less than 10^n.

0, 12, 163, 1881, 20192, 210678, 2167602, 22119050, 224575958, 2272470765, 22940965468, 231196012323, 2326967172345, 23397529032871, 235077714312816, 2360380827753871, 23688221418030854, 237630022854838725 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`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]`
	EXAMPLE	`Below 10^2 there are 12 odd composites 3 mod 4 so a(2)=12`
	CROSSREFS	`Cf. A093151 A093153 A091295 A091098 A091099.` `Sequence in context: A109391 A138455 A024221 * A143583 A203372 A193104` `Adjacent sequences: A093149 A093150 A093151 * A093153 A093154 A093155`
	KEYWORD	`nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net), Mar 24 2004`
	EXTENSIONS	`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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Last modified February 17 09:04 EST 2012. Contains 205998 sequences.