A140240 Decimal expansion of arccos(7/8).

5, 0, 5, 3, 6, 0, 5, 1, 0, 2, 8, 4, 1, 5, 7, 3, 0, 6, 9, 7, 1, 3, 1, 4, 8, 7, 3, 9, 8, 7, 4, 2, 1, 9, 4, 4, 5, 0, 4, 3, 8, 7, 4, 6, 6, 1, 9, 3, 6, 7, 6, 3, 8, 7, 2, 6, 7, 8, 4, 7, 5, 5, 7, 4, 8, 1, 1, 5, 0, 1, 2, 0, 9, 6, 2, 0, 4, 2, 4, 4, 4, 8, 2, 3, 4, 9, 7, 4, 8, 4, 4, 5, 6, 0, 2, 9, 2, 0, 3, 2, 1, 0, 1, 8, 5

Offset: 0

Author

Rick L. Shepherd, May 14 2008

Keywords

• cons
• nonn

Comments

Angle in radians of the least angle of the obtuse scalene triangle with sides of lengths 2, 3 and 4, the scalene triangle with least integer side lengths.

A140240 + A140242 + A140244 = arccos(7/8) + arccos(11/16) + arccos(-1/4) = Pi.

Examples

			0.50536051028415730697131487398742194450438746619367638726784755748115012096...
		

Links

• Index entries for transcendental numbers

Crossrefs

Cf. A140239, A140241, A140242, A140243, A140244, A140245, A140246, A140247, A140248, A140249.

Programs

Mathematica

RealDigits[ArcCos[7/8],10,120][[1]] (* Harvey P. Dale, Jan 13 2019 *)

PARI

acos(7/8)

Formula

arccos(7/8) = arcsin(sqrt(15)/8) = arctan(sqrt(15)/7).