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%I #31 Feb 07 2022 11:16:54
%S 6,5,5,1,3,6,3,7,7,5,6,2,0,3,3,5,5,3,0,9,3,9,3,5,8,8,5,6,2,4,6,6,1,7,
%T 1,0,5,4,1,0,1,8,2,8,5,1,9,5,5,3,0,7,0,4,5,7,7,9,6,7,4,7,0,3,9,6,5,6,
%U 0,5,6,7,4,5,8,7,4,0,4,0,0,6,4,8,5,3,9
%N Decimal expansion of sqrt(2 - Pi/2), the coefficient for standard distribution of the Rayleigh random variable.
%C The standard distribution of a Rayleigh random variable with shape parameter s is s*sqrt(2 - Pi/2).
%H <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F Equals sqrt(A180434).
%e 0.65513637756203355309393588562466171054101828519553...
%t RealDigits[Sqrt[2 - Pi/2], 10, 100][[1]] (* _Amiram Eldar_, Feb 07 2022 *)
%o (PARI) sqrt(2 - Pi/2)
%Y Cf. A000796, A019669, A180434.
%K nonn,cons
%O 0,1
%A _Charles R Greathouse IV_, Feb 07 2022