id:A049690 - OEIS Search Results

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a(n)=Sum_{k=1..n} phi(2*k), where phi = Euler totient function, cf. A000010.

+0
5

0, 1, 3, 5, 9, 13, 17, 23, 31, 37, 45, 55, 63, 75, 87, 95, 111, 127, 139, 157, 173, 185, 205, 227, 243, 263, 287, 305, 329, 357, 373, 403, 435, 455, 487, 511, 535, 571, 607, 631, 663, 703, 727, 769, 809, 833, 877, 923, 955, 997, 1037, 1069, 1117, 1169, 1205, 1245 (list; graph; listen)

	OFFSET	`0,3`
	CROSSREFS	`a(n)=b(2n), where b=A049689.` `Sequence in context: A063915 A096228 A061571 this_sequence A080075 A007664 A114395` `Adjacent sequences: A049687 A049688 A049689 this_sequence A049691 A049692 A049693`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), May 18 2001`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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