id:A073518 - OEIS Search Results

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Cotangent of Pi/prime(n), rounded to nearest integer.

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0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 13, 14, 15, 17, 19, 19, 21, 23, 23, 25, 26, 28, 31, 32, 33, 34, 35, 36, 40, 42, 44, 44, 47, 48, 50, 52, 53, 55, 57, 58, 61, 61, 63, 63, 67, 71, 72, 73, 74, 76, 77, 80, 82, 84, 86, 88, 89, 90, 93, 98, 99, 100, 101, 105, 107, 110, 111, 112 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n)=round(cotan(pi/p(n)) or a(n)=round(1/tan(pi/p(n))`
	EXAMPLE	`n=8: p(n)=19; cotan(pi/19)=5.9926... => 6.`
	CROSSREFS	`Sequence in context: A039163 A125299 A063949 this_sequence A144769 A165737 A033104` `Adjacent sequences: A073515 A073516 A073517 this_sequence A073519 A073520 A073521`
	KEYWORD	`nonn`
	AUTHOR	`Werner Sand (werner.sand(AT)tiscalimail.de), Aug 31 2002`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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