id:A014200 - OEIS Search Results

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

+0
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; listen)

	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 this_sequence A140200 A029039 A131429` `Adjacent sequences: A014197 A014198 A014199 this_sequence A014201 A014202 A014203`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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