Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #29 Sep 08 2022 08:44:44
%S 4,1,3,2,7,3,1,3,5,4,1,2,2,4,9,2,9,3,8,4,6,9,3,9,1,8,8,4,2,9,9,8,5,2,
%T 6,4,9,4,4,5,5,2,1,9,1,6,9,9,1,3,0,8,4,5,1,5,5,6,6,5,1,2,5,3,7,9,7,9,
%U 5,7,9,2,8,5,1,3,4,1,7,0,3,2,3,6,2,5,2,0,3,6,2,4,5,5,4,6,6,2,8
%N Decimal expansion of sqrt(2*Pi*e).
%D Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, p. 220.
%H G. C. Greubel, <a href="/A019633/b019633.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from Ivan Panchenko)
%F Equals 2*A059444. - _Michel Marcus_, May 13 2014
%F Equals Integral_{x>=0} exp(-log(x)^2/2) dx. - _Amiram Eldar_, Apr 07 2021
%t RealDigits[Sqrt[2Pi E],10,120][[1]] (* _Harvey P. Dale_, Apr 16 2013 *)
%o (PARI) sqrt(2*Pi*exp(1)) \\ _Charles R Greathouse IV_, May 14 2014
%o (Magma) C<i> := ComplexField(); Sqrt(2*Pi(C)*Exp(1)); // _G. C. Greubel_, Jan 28 2018
%Y Cf. A059444.
%K nonn,cons
%O 1,1
%A _N. J. A. Sloane_, Dec 11 1996