id:A057672 - OEIS Search Results

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a(n) equals floor(As(n) - Ac(n)), where As(n) is the area of the square with side length n and Ac(n) is the area of the circle of diameter n.

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0, 0, 1, 3, 5, 7, 10, 13, 17, 21, 25, 30, 36, 42, 48, 54, 62, 69, 77, 85, 94, 103, 113, 123, 134, 145, 156, 168, 180, 193, 206, 219, 233, 248, 262, 278, 293, 309, 326, 343, 360, 378, 396, 415, 434, 454, 474, 494, 515, 536, 558, 580, 602, 625, 649, 672, 697, 721, 747, 772, 798 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`a(n)=floor(n^2*(1-pi/4))`
	EXAMPLE	`a(7)=10 since floor(7^2(1-pi/4)) = 10.`
	CROSSREFS	`Sequence in context: A029899 A072166 A077000 this_sequence A112509 A054040 A011848` `Adjacent sequences: A057669 A057670 A057671 this_sequence A057673 A057674 A057675`
	KEYWORD	`nonn`
	AUTHOR	`seiringer.flor(AT)eudoramail.com, Oct 18 2000`
	EXTENSIONS	`Edited and extended by James Sellers, Oct 20, 2000.`

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Last modified March 19 01:26 EDT 2010. Contains 173632 sequences.

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