id:A156745 - OEIS Search Results

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a(n) = Sum_{k=1..n} floor((n+k)/k) = n + Sum_{k=1..n} sigma_0(k), where sigma_0(k) is A000005(k). Also a(n)= A000027(n)+ A006218(n).

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2, 5, 8, 12, 15, 20, 23, 28, 32, 37, 40, 47, 50, 55, 60, 66, 69, 76, 79, 86 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Generalized sequence a(n)= Sum_{k=1..n} floor((n+kt)/k) = tn + Sum_{k=1..n} sigma_0(k), where sigma_0(k) is A000005(k). Also a(n)=t*A000027(n)+A006218(n).`
	CROSSREFS	`Cf. A006218, A153818, A118014, A002541` `Sequence in context: A092767 A108311 A080753 this_sequence A087347 A062468 A061717` `Adjacent sequences: A156742 A156743 A156744 this_sequence A156746 A156747 A156748`
	KEYWORD	`easy,nonn`
	AUTHOR	`Ctibor O. Zizka (c.zizka(AT)email.cz), Feb 14 2009`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.