id:A144981 - OEIS Search Results

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Decimal expansion of cos(Pi/8) = cos(22.5 degrees).

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9, 2, 3, 8, 7, 9, 5, 3, 2, 5, 1, 1, 2, 8, 6, 7, 5, 6, 1, 2, 8, 1, 8, 3, 1, 8, 9, 3, 9, 6, 7, 8, 8, 2, 8, 6, 8, 2, 2, 4, 1, 6, 6, 2, 5, 8, 6, 3, 6, 4, 2, 4, 8, 6, 1, 1, 5, 0, 9, 7, 7, 3, 1, 2, 8, 0, 5, 3, 5, 0, 0, 7, 5, 0, 1, 1, 0, 2, 3, 5, 8, 7, 1, 4, 8, 3, 9, 9, 3, 4, 8, 5, 0, 3, 4, 4, 5, 9, 6, 0, 9, 7, 9, 6, 3 (list; cons; graph; listen)

	OFFSET	`0,1`
	COMMENT	`cos(Pi/5) is A019863. cos(Pi/6) is A010527. cos(Pi/7) is A073052. cos(Pi/9) is A019879.`
	FORMULA	`(2+2^(1/2))^(1/2)/2 = sqrt(3.41421....)/2 = 1.8477759.../2 .` `Equals 2F1(11/16,5/16;1/2;3/4) / 2. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 27 2008]`
	EXAMPLE	`Equals 0.923879532511286756128183189396788286822416625863642486115097...`
	MAPLE	`evalf(sqrt(2+sqrt(2))/2) ;`
	CROSSREFS	`Sequence in context: A160108 A011344 A137197 this_sequence A133841 A099769 A020784` `Adjacent sequences: A144978 A144979 A144980 this_sequence A144982 A144983 A144984`
	KEYWORD	`cons,easy,nonn`
	AUTHOR	`R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 28 2008`

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

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