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A090551 Decimal expansion of sqrt(3) - Pi/2. 0


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

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

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

%N Decimal expansion of sqrt(3) - Pi/2.

%C Decimal expansion of the real number quantifying the area of the Apollonian gasket of three congruent circles of radius 1.

%C General solution: This constant is the ratio of r^2, where r is the radius of three congruent circles forming a Apollonian gasket, to the area of that Apollonian gasket.

%C sqrt(3)-pi/2 is the area enclosed between three identical osculating circles of unit radius. - _Lekraj Beedassy_, Apr 12 2006

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ApollonianGasket.html">Apollonian Gasket</a>.

%F a(n) = 3^(1/2) - pi/2.

%e 0.16125448077398067429612464986612...

%e RealDigits[ Sqrt[3] - Pi/2, 10, 105][[1]]

%t RealDigits[N[Sqrt[3] - Pi/2, 300]][[1]] (* _Vladimir Joseph Stephan Orlovsky_, Jul 03 2011 *)

%Y Cf. A002194; A019669.

%K cons,nonn

%O 0,2

%A Christopher M. Tomaszewski (cmt1288(AT)comcast.net), Feb 01 2004

%E More terms from _Robert G. Wilson v_, Feb 09 2004

%E Edited by _N. J. A. Sloane_, Jul 05 2008 at the suggestion of _Rick L. Shepherd_

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Last modified February 25 19:39 EST 2021. Contains 341618 sequences. (Running on oeis4.)