id:A071340 - OEIS Search Results

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a(n) = least positive r <= n such that the origin-centered circle of radius sqrt(r) touches A071339(n) lattice points.

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0, 1, 1, 5, 5, 25, 25, 25, 25, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105 (list; graph; listen)

	OFFSET	`0,4`
	LINKS	`Hugo Pfoertner, Illustration`
	EXAMPLE	`a(4)=5 because the smallest circle to touch A071339(4)=8 points has radius sqrt(5).`
	PROGRAM	`(FORTRAN) See A071339.`
	CROSSREFS	`Cf. A071339-A071347.` `Adjacent sequences: A071337 A071338 A071339 this_sequence A071341 A071342 A071343` `Sequence in context: A014619 A097016 A090936 this_sequence A056451 A074872 A038247`
	KEYWORD	`easy,nonn`
	AUTHOR	`Hugo Pfoertner (hugo(AT)pfoertner.org), May 22 2002`
	EXTENSIONS	`Edited by Don Reble (djr(AT)nk.ca), Nov 06 2005`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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