id:A051623 - OEIS Search Results

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Sum (x^2 - n), for x=1+[sqrt(n)] to [sqrt(2n)].

+0
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0, 0, 1, 0, 4, 3, 2, 1, 7, 6, 5, 4, 15, 13, 11, 9, 8, 7, 23, 21, 19, 17, 15, 13, 35, 33, 31, 29, 27, 25, 23, 21, 50, 47, 44, 41, 39, 37, 35, 33, 71, 68, 65, 62, 59, 56, 53, 50, 47, 45, 92, 89, 86, 83, 80, 77, 74, 71, 68, 65, 122, 118, 114 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`a(13)=15 because [sqrt(13)]=3, [sqrt(213)]=5 and (44-13)+(5*5-13) = 15.`
	CROSSREFS	`Sequence in context: A105313 A085064 A030587 this_sequence A113778 A155172 A129154` `Adjacent sequences: A051620 A051621 A051622 this_sequence A051624 A051625 A051626`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joe K. Crump (joecr(AT)carolina.rr.com)`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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