id:A092871 - OEIS Search Results

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Count of composites < 10^n.

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4, 73, 830, 8769, 90406, 921500, 9335419, 94238543, 949152464, 9544947487, 95881945185, 962392087980, 9653934463159, 96795058249196, 970155429577329, 9720761658966073, 97376442842345765, 975260045712259138 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The number 1 is omitted from the count as it is neither prime nor composite`
	LINKS	`C. Caldwell, The Prime Pages, How many primes are there? Table 1. Values of pi(x).`
	FORMULA	`Subtract prime count from 10^n. From result subtract 2 to omit 1 and number at 10^n itself.`
	EXAMPLE	`10^3=1000. 1000-2=998. a(3)=830 because the 830 composites+168 primes must total 998.`
	CROSSREFS	`Cf. A065894, A006880, A092801, A092802.` `Sequence in context: A081460 A055556 A089665 this_sequence A090212 A137046 A104335` `Adjacent sequences: A092868 A092869 A092870 this_sequence A092872 A092873 A092874`
	KEYWORD	`easy,nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net), Mar 08 2004`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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