id:A105221 - OEIS Search Results

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a(n) = the sum of n's distinct prime factors below n.

+0
5

0, 0, 0, 2, 0, 5, 0, 2, 3, 7, 0, 5, 0, 9, 8, 2, 0, 5, 0, 7, 10, 13, 0, 5, 5, 15, 3, 9, 0, 10, 0, 2, 14, 19, 12, 5, 0, 21, 16, 7, 0, 12, 0, 13, 8, 25, 0, 5, 7, 7, 20, 15, 0, 5, 16, 9, 22, 31, 0, 10, 0, 33, 10, 2, 18, 16, 0, 19, 26, 14, 0, 5, 0, 39, 8, 21, 18, 18, 0, 7, 3, 43, 0, 12, 22, 45 (list; graph; listen)

	OFFSET	`1,4`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	EXAMPLE	`a(12)=5 because 12's distinct prime factors 2 and 3 sum to 5.`
	CROSSREFS	`Cf. A003508.` `Cf. A008472` `Sequence in context: A066442 A086134 A071090 this_sequence A061376 A058974 A019962` `Adjacent sequences: A105218 A105219 A105220 this_sequence A105222 A105223 A105224`
	KEYWORD	`easy,nonn`
	AUTHOR	`Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), Apr 13 2005`
	EXTENSIONS	`Edited by Don Reble (djr(AT)nk.ca), Nov 17 2005`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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