A195479 Decimal expansion of shortest length, (A), of segment from side AB through centroid to side AC in right triangle ABC with sidelengths (a,b,c)=(2,sqrt(5),3).

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

Offset

1,2

Comments

See A195304 for definitions and a general discussion.

Links

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

Example

(A)=1.24406215675473698925469297613441440690...

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, A195480, A195481, A195482.

Sequence in context: A198362 A197827 A352452 * A112793 A372037 A009116

Adjacent sequences: A195476 A195477 A195478 * A195480 A195481 A195482

Keyword

nonn,cons

Author

Clark Kimberling, Sep 19 2011

Status

approved