id:A137914 - OEIS Search Results

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Decimal expansion of arccos(1/3).

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4

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

	OFFSET	`1,2`
	COMMENT	`Dihedral angle in radians of regular tetrahedron.` `Arccos(1/3) is the central angle of a cube, made by the center and two neighboring vertices. [From Clark Kimberling (ck6(AT)evansville.edu), Feb 10 2009]`
	LINKS	`Jackson, Frank and Weisstein, Eric W., Tetrahedron` `Weisstein, Eric W., Dihedral Angle`
	FORMULA	`arccos(1/3) = arctan(2sqrt(2)) = 2arcsin(sqrt(3)/3) = arcsin(2*sqrt(2)/3).`
	EXAMPLE	`1.2309594173407746821349291782479873757103400093550948390555483336639923144...`
	PROGRAM	`(PARI) acos(1/3)`
	CROSSREFS	`Cf. A137915 (same in degrees).` `Sequence in context: A020823 A021437 A074760 this_sequence A098989 A012399 A012403` `Adjacent sequences: A137911 A137912 A137913 this_sequence A137915 A137916 A137917`
	KEYWORD	`cons,nonn`
	AUTHOR	`Rick L. Shepherd (rshepherd2(AT)hotmail.com), Feb 22 2008`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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