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%I #14 Sep 30 2022 23:27:44
%S 8,0,3,0,7,7,8,7,0,9,7,4,0,5,8,4,2,8,1,8,4,3,2,1,2,4,4,6,6,9,0,3,4,8,
%T 2,3,1,8,9,8,9,1,0,9,9,6,4,0,9,6,6,1,3,6,6,2,9,8,4,3,5,0,7,2,1,4,7,9,
%U 8,3,5,6,0,5,0,9,0,4,6,4,2,0,1,0,8,2,0,8,7,6,3,8,5,8,2,6,6,5,0,6,7,3,2
%N Decimal expansion of sqrt(Pi^2/6 - 1) = sqrt(zeta(2) - 1).
%C Also the total harmonic distortion (THD) of a sawtooth signal, see formula (15) in the Blagouchine & Moreau link.
%H I. V. Blagouchine and E. Moreau, <a href="http://dx.doi.org/10.1109/TCOMM.2011.061511.100749">Analytic Method for the Computation of the Total Harmonic Distortion by the Cauchy Method of Residues.</a> IEEE Trans. Commun., vol. 59, no. 9, pp. 2478-2491, 2011. <a href="http://iblagouchine.perso.centrale-marseille.fr/IEEE-TCOM-2011-061511-100749.php">PDF file</a>.
%H <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F Equals sqrt(A013661 - 1).
%e 0.8030778709740584281843212446690348231898910996409661...
%p evalf(sqrt((1/6)*Pi^2-1), 120)
%t RealDigits[Sqrt[Pi^2/6 - 1], 10, 120][[1]]
%o (PARI) default(realprecision, 120); sqrt(Pi^2/6-1)
%o (MATLAB) format long; sqrt(pi^2/6-1)
%Y Cf. A013661, A300690, A300714, A300727, A300731.
%K nonn,cons
%O 0,1
%A _Iaroslav V. Blagouchine_, Mar 11 2018
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