A195452 - OEIS

%I #6 Mar 30 2012 18:57:45

%S 1,7,4,9,9,9,1,1,3,2,9,1,2,7,8,8,9,6,8,3,6,6,2,7,9,5,8,7,7,9,2,2,9,5,

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

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

%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)=(2,3,sqrt(13)).

%C See A195304 for definitions and a general discussion.

%e (C)=1.7499911329127889683662795877922959710...

%t a = 2; 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) A195450 *)

%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) A195451 *)

%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) A195452  *)

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

%t RealDigits[%, 10, 100] (* Philo(ABC,G) A195453 *)

%Y Cf. A195304.

%K nonn,cons

%O 1,2

%A _Clark Kimberling_, Sep 18 2011