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A243596 Decimal expansion of the solid angle in steradians (sr) subtended by a cone with the polar angle of 1 radian (rad). 2
2, 8, 8, 8, 3, 6, 5, 7, 9, 7, 5, 1, 3, 6, 4, 0, 1, 3, 7, 5, 4, 3, 1, 2, 1, 7, 4, 0, 5, 5, 0, 0, 9, 2, 3, 1, 9, 8, 4, 1, 5, 2, 5, 9, 9, 2, 9, 5, 9, 0, 1, 0, 2, 3, 8, 4, 7, 2, 8, 7, 2, 8, 1, 0, 0, 2, 8, 7, 3, 7, 2, 0, 6, 5, 6, 4, 4, 6, 7, 0, 2, 6, 0, 8, 0, 6, 9, 8, 9, 5, 5, 6, 5, 8, 7, 4, 0, 9, 6, 7, 6, 9, 4, 5, 3 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Given a right circular cone with polar angle theta, the solid angle it subtends is 2*Pi(1-cos(theta)). Not to be confused with the area, in steradians, of a spherical square with the side theta (see A231986).

LINKS

Stanislav Sykora, Table of n, a(n) for n = 1..2000

Wikipedia, Solid angle

Wikipedia, Steradian

Wikipedia, Cone

FORMULA

2*Pi*(1-cos(1)) = 4*Pi*A243597.

EXAMPLE

2.8883657975136401375431217405500923198415259929590102...

MATHEMATICA

RealDigits[2 Pi (1 - Cos[1]), 10, 111][[1]] (* Robert G. Wilson v, Jun 12 2014 *)

PROG

(PARI) 2*Pi*(1-cos(1))

CROSSREFS

Cf. A231986, A243597 (fraction of full solid angle).

Sequence in context: A105388 A178247 A048651 * A256849 A138300 A137575

Adjacent sequences:  A243593 A243594 A243595 * A243597 A243598 A243599

KEYWORD

nonn,cons,easy

AUTHOR

Stanislav Sykora, Jun 07 2014

STATUS

approved

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Last modified June 22 23:15 EDT 2017. Contains 288633 sequences.