A093151 - OEIS

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A093151

Number of odd composites 1 mod 4 less than 10^n.

1, 13, 169, 1890, 20216, 210824, 2167819, 22119495, 224576508, 2272476724, 22940979719, 231196075659, 2326967290816, 23397529216327, 235077715264515, 2360380831212204, 23688221424314913, 237630022857420415, 2382971166402199310, 23889590198849417292 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`Count odd composites 1 mod 4 less than 10^n` `For n>1, a(n) = 25*10^(n-2) - 1 - A091098(n). - Max Alekseyev (maxale(AT)gmail.com), May 30 2007`
	EXAMPLE	`Below 10^2 there are 13 odd composites so a(2)=13`
	CROSSREFS	`Cf. A093152 A093153 A091295 A091098 A091099.` `Sequence in context: A207178 A188749 A045589 * A188869 A014956 A171287` `Adjacent sequences: A093148 A093149 A093150 * A093152 A093153 A093154`
	KEYWORD	`nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net), Mar 24 2004`
	EXTENSIONS	`More terms from Max Alekseyev (maxale(AT)gmail.com), May 30 2007` `Extended by Max Alekseyev (maxale(AT)gmail.com), Oct 13 2009`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.