id:A120109 - OEIS Search Results

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A120109

Row sums of number triangle A120108.

+0
2

1, 3, 10, 21, 106, 107, 750, 1501, 4504, 4505, 49556, 49557, 644242, 644243, 644244, 1288489, 21904314, 21904315, 416181986, 416181987, 416181988, 416181989, 9572185748, 9572185749, 47860928746, 47860928747, 143582786242 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=sum{k=0..n, lcm(1,..,n+1)/lcm(1,..,k+1)}.`
	CROSSREFS	`Sequence in context: A081950 A071563 A139116 this_sequence A068082 A058077 A122795` `Adjacent sequences: A120106 A120107 A120108 this_sequence A120110 A120111 A120112`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jun 09 2006`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research