id:A135607 - OEIS Search Results

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Floor of the area of a circle in terms of its circumference n.

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0, 0, 0, 0, 1, 1, 2, 3, 5, 6, 7, 9, 11, 13, 15, 17, 20, 22, 25, 28, 31, 35, 38, 42, 45, 49, 53, 58, 62, 66, 71, 76, 81, 86, 91, 97, 103, 108, 114, 121, 127, 133, 140, 147, 154, 161, 168, 175, 183, 191, 198, 206, 215, 223, 232, 240, 249, 258, 267, 277, 286, 296, 305, 315 (list; graph; listen)

	OFFSET	`0,7`
	FORMULA	`Area of a circle of radius r is A = Pir^2. Circumference of a circle of radius r is n = 2Pir. Then area in terms of the circumference n is A = n^2/(4Pi).`
	EXAMPLE	`For a circle of circumference 10, the floor of the area A = floor(100/4/Pi) = 7, the 11-th entry in the sequence.`
	PROGRAM	`(PARI) g(n) = for(c=0, n, a=c^2/4/Pi; print1(floor(a)", "))`
	CROSSREFS	`Sequence in context: A106843 A057165 A023884 this_sequence A026453 A026455 A085717` `Adjacent sequences: A135604 A135605 A135606 this_sequence A135608 A135609 A135610`
	KEYWORD	`nonn`
	AUTHOR	`Cino Hilliard (hillcino368(AT)hotmail.com), Feb 27 2008`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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