

A115028


Special triangle sides and areas of triangles that transform as Weierstrass elliptic in structure based on the formula A=s*(sa)*sb)*(sc): s=36.


0



24, 24, 24, 62208, 24, 30, 18, 46656, 30, 24, 18, 46656, 30, 30, 12, 31104
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OFFSET

0,1


COMMENTS

Starting with the formula: A=s*(sa)*sb)*(sc)=w^2=(ds/dt)^2 a transform set is used to get: A1=4*(s1a1)*(s1b1)*(s1c1)=w1^2=(ds1/dt)^2 w1=2*w/Sqrt[s] s1=s/3 a1=a2*s/3 b1=b2*s/3 c1=c2*s/3 The s=36 is found from solving the differential equation in w and w1 with the known condition that s=(a+b+c)/2. The solution set has four integer sided solutions.


LINKS

Table of n, a(n) for n=0..15.


FORMULA

{a(n),a(n+1),a(+2),a(n+3)}={a,b,c,A }[n]


EXAMPLE

a+b+c=24+24+ 24=2*s=72: Area=62208 ( equilateral)
a+b+c=24+ 30+ 18=2*s=72: Area=46656 ( 3,4,5 triangle)
a+b+c=30+ 30+ 12=2*s=72: Area=31104 ( the surprise: a 5,5,2 triangle has minimum area)


MATHEMATICA

n1[n_] = 18 + n; m1[m_] = 18 + m; l1[n_, m_] = 72  m1[m]  n1[n]; C0 = Delete[Union[Flatten[Union[Table[Table[If[s*(s  n1[n])*(s  m1[m])*(s  l1[n, m]) > 0 && n1[n]*m1[m]*l1[n, m] > 0, {n1[n], m1[m], l1[n, m], s*(s  n1[n])*(s  m1[m])*(s  l1[n, m])}, {}], {n, 1, 24}], {m, 1, 24}]], 1]], 1] Flatten[C0]


CROSSREFS

Sequence in context: A010863 A217140 A235249 * A099543 A188311 A185497
Adjacent sequences: A115025 A115026 A115027 * A115029 A115030 A115031


KEYWORD

nonn,uned


AUTHOR

Roger L. Bagula, Feb 24 2006


STATUS

approved



