id:A051193 - OEIS Search Results

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Sum {LCM(n,k): k=1,2,...,n}.

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6

1, 4, 12, 24, 55, 66, 154, 176, 279, 320, 616, 468, 1027, 910, 1110, 1376, 2329, 1656, 3268, 2320, 3171, 3674, 5842, 3624, 6525, 6136, 7398, 6636, 11803, 6630, 14446, 10944, 12837, 13940, 15820, 12096, 24679, 19570, 21450 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000` `Index entries for sequences related to lcm's`
	FORMULA	`a(n) = n(1+Sum_{d\|n} dphi(d))/2 = n(1+A057660(n))/2 = nA057661(n). - Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 21 2002`
	MAPLE	`a:=n->sum(ilcm( n, 1, j ), j=0..n): seq(a(n), n=1..39); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 07 2006`
	CROSSREFS	`Cf. A051173.` `Cf. A000010.` `Sequence in context: A037338 A136486 A003203 this_sequence A025543 A064354 A073841` `Adjacent sequences: A051190 A051191 A051192 this_sequence A051194 A051195 A051196`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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

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