id:A036335 - OEIS Search Results

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Total number of composite numbers with n digits and n prime factors (counted with multiplicity).

+0
4

0, 31, 225, 1563, 10222, 63030, 374264, 2160300 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`C. Rivera, Related puzzle`
	EXAMPLE	`a(1) = 0, since any single digit number with 1 prime factor is a prime!`
	CROSSREFS	`Cf. A036336-A036338.` `Adjacent sequences: A036332 A036333 A036334 this_sequence A036336 A036337 A036338` `Sequence in context: A042874 A001136 A142939 this_sequence A075931 A142440 A075932`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Dec 15 1998.`
	EXTENSIONS	`One more term from Naohiro Nomoto (6284968128(AT)geocities.co.jp), Jul 31 2001`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.