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%I #5 Dec 11 2024 15:39:48
%S 2,7,8,6,5,8,4,8,3,2,1,5,5,0,1,9,8,7,6,6,2,8,9,5,2,0,2,4,8,8,7,7,9,1,
%T 2,0,0,2,6,9,1,9,2,6,5,6,7,8,2,3,3,2,6,7,1,5,1,6,2,4,0,6,0,3,2,0,9,1,
%U 4,5,1,5,3,6,6,4,1,7,2,6,7,9,2,1,1,2,2,9,9,6,2,2,6,6,5,2,6,8,4,2
%N Decimal expansion of (1/sqrt(Pi) + e*erfc(-1))/2.
%D Steven R. Finch, Mathematical Constants, Encyclopedia of Mathematics and its Applications, vol. 94, Cambridge University Press, 2003, Section 4.6, p. 262.
%F Equals (1 + e*sqrt(Pi)*(1 + erf(1)))/(2*sqrt(Pi)).
%e 2.7865848321550198766289520248877912002691926567823...
%t RealDigits[(1/Sqrt[Pi]+E Erfc[-1])/2,10,100][[1]]
%Y Cf. A001113, A019739, A087197, A087198, A099286.
%K nonn,cons
%O 1,1
%A _Stefano Spezia_, Dec 11 2024