A140240 - OEIS

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

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OFFSET

0,1

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.

LINKS

Table of n, a(n) for n=0..104.

FORMULA

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

EXAMPLE

0.50536051028415730697131487398742194450438746619367638726784755748115012096...

MATHEMATICA

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

PROG

(PARI) acos(7/8)

CROSSREFS