A195472 - OEIS

A195472

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)=(1,sqrt(2),sqrt(3)).

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

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OFFSET

1,3

COMMENTS

See A195304 for definitions and a general discussion.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

EXAMPLE

(B)=1.1324489836725644804259712518338035968298278...

MATHEMATICA

a = 1; b = Sqrt[2]; 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) A195471 *)

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) A195472 *)

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) A195473 *)

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

RealDigits[%, 10, 100] (* Philo(ABC, G) A195474 *)

CROSSREFS

Cf. A195304.

Sequence in context: A147604 A095401 A309511 * A370806 A240538 A326923

Adjacent sequences: A195469 A195470 A195471 * A195473 A195474 A195475

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Sep 19 2011

STATUS

approved