id:A062550 - OEIS Search Results

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Sum([2n/k]).

+0
2

0, 3, 8, 14, 20, 27, 35, 41, 50, 58, 66, 74, 84, 91, 101, 111, 119, 127, 140, 146, 158, 168, 176, 186, 198, 207, 217, 227, 239, 247, 261, 265, 276, 286, 292, 302, 314, 318, 328, 338, 348, 355, 367, 373, 383, 395, 403, 409, 423, 429, 442, 450, 458, 468, 480 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`The sequence A006218 : Sum_{i=1..n} floor(n/i) = Sum_{i=1..n} sigma_0(i). Sigma_0(i) is A000005. Sequences of the type : Sum_{i=1..f(n)} floor(f(n)/i)= Sum_{i=1..f(n)} sigma_0(i). This sequence A062550(n)= A006218(2*n). [From Ctibor O. Zizka (c.zizka(AT)email.cz), Mar 21 2009]`
	FORMULA	`a(n) =A006218(2n) =A056549(n)+A006218(n) =a(n-1)+A000005(2n-1)+A000005(2n)`
	CROSSREFS	`Cf. A013942.` `Cf. A156745,A085831,A153816,A153817,A153876 [From Ctibor O. Zizka (c.zizka(AT)email.cz), Mar 21 2009]` `Sequence in context: A140492 A028252 A063617 this_sequence A022947 A098762 A014848` `Adjacent sequences: A062547 A062548 A062549 this_sequence A062551 A062552 A062553`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jun 26 2001`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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