This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A300714 #23 Mar 25 2018 14:59:58 %S A300714 3,6,9,4,8,6,1,8,2,0,9,5,2,0,4,3,7,3,1,2,0,0,5,4,6,9,1,4,2,3,9,7,6,9, %T A300714 9,3,6,6,0,2,3,6,1,5,8,6,7,9,0,8,3,8,2,5,8,9,1,6,4,9,1,8,9,0,0,1,5,1, %U A300714 7,9,3,1,4,2,0,0,6,6,9,9,8,3,5,0,8,2,8,4,2,5,6,1,0,2,7,6,7,4,1,8,9,8,0 %N A300714 Decimal expansion of the total harmonic distortion (THD) of the sawtooth signal filtered by a 1st-order low-pass filter. %C A300714 See formula (33) in the Blagouchine & Moreau link. %H A300714 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>. %F A300714 Equals sqrt(Pi^2/3 - Pi*coth(Pi)). %e A300714 0.3694861820952043731200546914239769936602361586790838... %p A300714 evalf(sqrt((1/3)*Pi^2-Pi*coth(Pi)), 120) %t A300714 RealDigits[Sqrt[Pi^2/3 - Pi*Coth[Pi]], 10, 120][[1]] %o A300714 (PARI) default(realprecision, 120); sqrt(Pi^2/3-Pi/tanh(Pi)) %o A300714 (MATLAB) format long; sqrt(pi^2/3-pi*coth(pi)) %Y A300714 Cf. A195055, A300690, A300713, A300727. %K A300714 nonn,cons %O A300714 0,1 %A A300714 _Iaroslav V. Blagouchine_, Mar 11 2018