A014200 - OEIS

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A014200

Number of solutions to x^2+y^2 <= n, excluding (0,0), divided by 4.

0, 1, 2, 2, 3, 5, 5, 5, 6, 7, 9, 9, 9, 11, 11, 11, 12, 14, 15, 15, 17, 17, 17, 17, 17, 20, 22, 22, 22, 24, 24, 24, 25, 25, 27, 27, 28, 30, 30, 30, 32, 34, 34, 34, 34, 36, 36, 36, 36, 37, 40, 40, 42, 44, 44, 44, 44, 44, 46 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`lim a(n)/n = pi/4` `a(n) = n - [n/3] + [n/5] - [n/7] + [n/9] - [n/11] + ... - Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 28 2003`
	CROSSREFS	`A014198/4.` `Cf. A059851.` `Sequence in context: A055769 A162217 A123575 * A140200 A029039 A131429` `Adjacent sequences: A014197 A014198 A014199 * A014201 A014202 A014203`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 23:08 EST 2012. Contains 206085 sequences.