%I A104123
%S A104123 4,6,6,9,2,0,1,6,0,9,1,8,3,4,9,2,4,5,1,4,5,0,6,6,1,8,9,4,0,5,2,3,3,0,6,
%T A104123 1,9,5,1,6,9,6,6,1,0,5,5,5,8,6,9,4,3,6,6,2,9,7,8,2,7,2,5,3,9,7,8,4,4,7,
%U A104123 0,7,2,7,7,6,2,6,6,7,4,8,0,6,6,9,9,8,4,8,0,4,1,8,4,4,3,2,0,1,4,8,7,4,0
%N A104123 Decimal expansion of the constant c = sqrt((137 - 1/(57+sqrt(Pi)/10))/
               (2*Pi)), an approximation to the Feigenbaum bifurcation velocity 
               constant delta (A006890).
%C A104123 c - delta = .000000000080501779597..., Gamma(delta) - InverseGamma(1/
               (c-delta)) = .50050037514..., ln(ln(1/(c-d))) - Pi = .00440025013324...
%e A104123 4.669201609183492451450661894052330619516966105558694366297827...
%t A104123 RealDigits[Sqrt[(137 - 1/(57 + Sqrt[Pi]/10))/(2 Pi)], 10, 110][[1]]
%Y A104123 Cf. A006890.
%Y A104123 Sequence in context: A049089 A028327 A006890 this_sequence A094078 A016122 
               A160995
%Y A104123 Adjacent sequences: A104120 A104121 A104122 this_sequence A104124 A104125 
               A104126
%K A104123 cons,nonn
%O A104123 1,1
%A A104123 Gerald McGarvey (gerald.mcgarvey(AT)comcast.net), Mar 06 2005