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Decimal expansion of the torsional rigidity constant for a square shaft.
2

%I #6 Aug 14 2015 00:05:41

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

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

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

%N Decimal expansion of the torsional rigidity constant for a square shaft.

%C No closed form is known.

%F (1 - (192*Sum_{n=1..infinity} (tanh(((-1 + 2*n)*Pi)/2)/(-1 + 2*n)^5))/Pi^5)/3.

%e 0.14057701495515371558...

%K nonn,cons

%O 0,2

%A _Eric W. Weisstein_, Aug 26 2010