login
Pythagorean Threesomes: triples of natural numbers defining the six legs of three Pythagorean triangles.
2

%I #42 Feb 11 2016 12:29:28

%S 44,117,240,240,252,275,88,234,480,85,132,720,160,231,792,132,351,720,

%T 480,504,550,176,468,960,170,264,1440,220,585,1200,720,756,825,320,

%U 462,1584,264,702,1440,308,819,1680,255,396,2160,960,1008,1100,352,936,1920,480,693,2376,396,1053,2160,429,880,2340,340,528,2880

%N Pythagorean Threesomes: triples of natural numbers defining the six legs of three Pythagorean triangles.

%C The sequence is sorted by increasing sums of triples and secondly by increasing order of first term.

%C The three numbers in a Pythagorean Threesome define the lengths of three sides of a tetrahedron with all integer length edges and one right angle vertex.

%C The sequence was calculated for the science fiction novel "The Fifth Jack" by Andreas Boe, Amazon books, 2014.

%C I do not have that book, but this sequence is closely related to (and may be an erroneous version of) A268396. - _Arkadiusz Wesolowski_, Feb 03 2016

%H Andreas Boe, <a href="/A245616/b245616.txt">Table of n, a(n) for n = 1..285</a>

%F x,y,sqrt(x^2+y^2) y,z,sqrt(y^2+z^2) z,x,sqrt(z^2+x^2)

%e (44,117,240) sqrt(44^2+117^2)=125 sqrt(117^2+240^2)=267 sqrt(240^2+44^2)=244

%Y Same numbers sorted gives A195816.

%Y Cf. A268396.

%K nonn

%O 1,1

%A _Andreas Boe_, Nov 05 2014

%E Edited by _N. J. A. Sloane_, Feb 11 2016