id:A064951 - OEIS Search Results

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Sum of LCM(x, y) for 1 <= x, y <= n.

+0
2

1, 7, 28, 72, 177, 303, 604, 948, 1497, 2127, 3348, 4272, 6313, 8119, 10324, 13060, 17701, 20995, 27512, 32132, 38453, 45779, 57440, 64664, 77689, 89935, 104704, 117948, 141525, 154755, 183616, 205472, 231113, 258959, 290564, 314720, 364041 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = a(n-1)+2A051193(n)-n = a(n-1)+nA057660(n) = sum_i, j{1<= i<= j<= n}[j^2/gcd(i, j)]. - Henry Bottomley (se16(AT)btinternet.com), Oct 29 2001`
	CROSSREFS	`Cf. A018806.` `Adjacent sequences: A064948 A064949 A064950 this_sequence A064952 A064953 A064954` `Sequence in context: A033582 A008457 A138503 this_sequence A073995 A061968 A024012`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Oct 28 2001`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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