A195448 - OEIS

%I #5 Mar 30 2012 18:57:45

%S 1,5,6,3,1,9,1,0,3,6,6,7,5,6,7,7,4,9,2,4,7,0,0,3,6,7,4,1,2,9,7,1,4,5,

%T 4,0,4,7,4,4,9,8,0,7,0,3,8,3,7,4,3,2,0,7,6,5,2,1,0,8,7,5,3,3,7,0,4,0,

%U 4,6,2,7,2,9,1,3,4,7,9,3,3,8,8,2,5,8,0,1,4,2,1,0,5,6,0,3,3,8,4,1

%N Decimal expansion of shortest length, (C), of segment from side CA through centroid to side CB in right triangle ABC with sidelengths (a,b,c)=(1,3,sqrt(10)).

%C See A195304 for definitions and a general discussion.

%e (C)=1.563191036675677492470036741297145404744...

%t a = 1; b = 3; h = 2 a/3; k = b/3;

%t f[t_] := (t - a)^2 + ((t - a)^2) ((a*k - b*t)/(a*h - a*t))^2

%t s = NSolve[D[f[t], t] == 0, t, 150]

%t f1 = (f[t])^(1/2) /. Part[s, 4]

%t RealDigits[%, 10, 100] (* (A) A195446  *)

%t f[t_] := (t - a)^2 + ((t - a)^2) (k/(h - t))^2

%t s = NSolve[D[f[t], t] == 0, t, 150]

%t f2 = (f[t])^(1/2) /. Part[s, 4]

%t RealDigits[%, 10, 100] (* (B) A195447 *)

%t f[t_] := (b*t/a)^2 + ((b*t/a)^2) ((a*h - a*t)/(b*t - a*k))^2

%t s = NSolve[D[f[t], t] == 0, t, 150]

%t f3 = (f[t])^(1/2) /. Part[s, 1]

%t RealDigits[%, 10, 100] (* (C) A195448 *)

%t c = Sqrt[a^2 + b^2]; (f1 + f2 + f3)/(a + b + c)

%t RealDigits[%, 10, 100] (* Philo(ABC,G) A195449 *)

%Y Cf. A195304.

%K nonn,cons

%O 1,2

%A _Clark Kimberling_, Sep 18 2011