A195480 Decimal expansion of shortest length, (B), of segment from side BC through centroid to side BA in right triangle ABC with sidelengths (a,b,c)=(2,sqrt(5),3).

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

Offset

1,2

Comments

See A195304 for definitions and a general discussion.

Links

Table of n, a(n) for n=1..100.

Example

(B)=1.99586724789639139098163600678265041581157...

Mathematica

a = 2; b = Sqrt[5]; h = 2 a/3; k = b/3;
f[t_] := (t - a)^2 + ((t - a)^2) ((a*k - b*t)/(a*h - a*t))^2
s = NSolve[D[f[t], t] == 0, t, 150]
f1 = (f[t])^(1/2) /. Part[s, 4]
RealDigits[%, 10, 100] (* (A) A195479 *)
f[t_] := (t - a)^2 + ((t - a)^2) (k/(h - t))^2
s = NSolve[D[f[t], t] == 0, t, 150]
f2 = (f[t])^(1/2) /. Part[s, 4]
RealDigits[%, 10, 100] (* (B) A195480 *)
f[t_] := (b*t/a)^2 + ((b*t/a)^2) ((a*h - a*t)/(b*t - a*k))^2
s = NSolve[D[f[t], t] == 0, t, 150]
f3 = (f[t])^(1/2) /. Part[s, 1]
RealDigits[%, 10, 100] (* (C) A195481 *)
c = Sqrt[a^2 + b^2]; (f1 + f2 + f3)/(a + b + c)
RealDigits[%, 10, 100] (* Philo(ABC, G) A195482 *)

Crossrefs

Cf. A195304.

Sequence in context: A201289 A091133 A334452 * A175619 A342683 A136130

Adjacent sequences: A195477 A195478 A195479 * A195481 A195482 A195483

Keyword

nonn,cons

Author

Clark Kimberling, Sep 19 2011

Status

approved