id:A083656 - OEIS Search Results

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a(n)=sum(i=1,n,floor(r*floor(r*i))) where r=sqrt(2).

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1, 3, 8, 15, 24, 35, 47, 62, 78, 97, 118, 140, 165, 191, 220, 251, 284, 319, 355, 394, 435, 478, 523, 569, 618, 668, 721, 776, 833, 892, 952, 1015, 1080, 1147, 1216, 1286, 1359, 1433, 1510, 1589, 1669, 1752, 1836, 1923, 2012, 2103, 2196, 2290, 2387, 2485, 2586 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Partial sums of A007069`
	FORMULA	`a(n) = n*(n-1+1/sqrt(2)) + O(1)`
	CROSSREFS	`Sequence in context: A064356 A157606 A086959 this_sequence A013648 A005563 A132411` `Adjacent sequences: A083653 A083654 A083655 this_sequence A083657 A083658 A083659`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 13 2003`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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