id:A031876 - OEIS Search Results

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Sum(floor(k^(1/3)),k=0..n).

+0
1

0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99, 102, 105, 108, 111, 114, 117, 120, 123, 126, 129, 132, 135, 138, 141, 144, 147, 150, 153, 156, 160 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(0)=0, a(1)=1, a(n)=2 a(n-1) - a(n-2) if n not a perfect cube, a(n)=2 a(n-1) - a(n-2) + 1 if n is a perfect cube.`
	CROSSREFS	`Sequence in context: A032957 A057202 A033059 this_sequence A008725 A011867 A026445` `Adjacent sequences: A031873 A031874 A031875 this_sequence A031877 A031878 A031879`
	KEYWORD	`nonn`
	AUTHOR	`TIXIER Michel (tixier(AT)dyadel.net)`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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