id:A120701 - OEIS Search Results

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A120701

Number of unit circles which fit touching a circle of radius n-1, i.e. with their centers on a circle of radius n.

+0
2

2, 6, 9, 12, 15, 18, 21, 25, 28, 31, 34, 37, 40, 43, 47, 50, 53, 56, 59, 62, 65, 69, 72, 75, 78, 81, 84, 87, 91, 94, 97, 100, 103, 106, 109, 113, 116, 119, 122, 125, 128, 131, 135, 138, 141, 144, 147, 150, 153, 157, 160, 163, 166, 169, 172, 175, 179, 182, 185, 188 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Coincides with A022844=Floor(n*Pi) except at n=1, 25510582, ... (sequence A120702)`
	FORMULA	`floor(Pi/asin(1/n))`
	CROSSREFS	`Cf. A022844, A002486, A001116.` `Sequence in context: A171504 A119720 A000134 this_sequence A112870 A086562 A083789` `Adjacent sequences: A120698 A120699 A120700 this_sequence A120702 A120703 A120704`
	KEYWORD	`easy,nonn`
	AUTHOR	`Martin Fuller (martin_n_fuller(AT)btinternet.com), Jun 28 2006`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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