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%I #11 Oct 01 2022 01:03:47
%S 8,6,9,7,6,6,8,0,5,3,1,1,4,8,5,8,2,6,2,8,0,2,1,0,9,8,2,9,7,2,9,2,1,0,
%T 9,8,2,9,0,2,4,0,1,6,9,3,5,5,4,5,3,9,8,0,7,5,8,1,7,1,7,4,0,8,6,5,0,1,
%U 2,1,1,1,2,3,3,4,3,8,2,0,5,0,8,5,5,8,1,3,6,9,4,2,4,0
%N Decimal expansion of (Pi^2/15)^(1/3).
%C In physics, ratio of the dimensionless blackbody radiation constant alpha_R to the dimensionless fine structure constant alpha.
%H Stanislav Sykora, <a href="/A249103/b249103.txt">Table of n, a(n) for n = 0..2000</a>
%H Ke Xiao, <a href="http://www.ejtp.com/articles/ejtpv8i25p379.pdf">Dimensionless Constants and Blackbody Radiation Laws</a>, Electronic Journal of Theoretical Physics, 8(2011), 379-388, Eq.4.
%H <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F Equals A182448^(1/3).
%e 0.869766805311485826280210982972921098290240169355453980758171740...
%t RealDigits[(Pi^2/15)^(1/3),10,120][[1]] (* _Vaclav Kotesovec_, Oct 22 2014 *)
%o (PARI) (Pi^2/15)^(1/3)
%Y Cf. A000796, A005600, A013661, A013662, A182448.
%K nonn,cons,easy
%O 0,1
%A _Stanislav Sykora_, Oct 21 2014
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