id:A050689 - OEIS Search Results

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Sum of digits of composite a(n) equals number of its prime factors.

+0
2

12, 30, 32, 40, 102, 220, 240, 500, 600, 1002, 1012, 1104, 1152, 1210, 1320, 1500, 2001, 2002, 2020, 2040, 2120, 2240, 2300, 3010, 3040, 3300, 4032, 4100, 4320, 5100, 5200, 6400, 7000, 7200, 10001, 10002, 10011, 10030, 10040, 10080, 10140, 10220 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`E.g. 2002 = 2+0+0+2 = 4 prime factors namely 2.7.11.13.`
	CROSSREFS	`Cf. A050690.` `Sequence in context: A045554 A161452 A049725 this_sequence A115912 A083096 A145469` `Adjacent sequences: A050686 A050687 A050688 this_sequence A050690 A050691 A050692`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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