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%I #10 Feb 07 2020 14:13:05
%S 60,84,90,132,144,210,264,270,288,300,312,330,390,408,432,440,450,456,
%T 462,468,510,520,546,552,570,576,588,612,616,680,684,690,700,728,760,
%U 770,800,810,816,828,870,910,912,918,920,952,1044,1064,1100,1104,1116
%N Perimeters of Pythagorean triangles that can be constructed in exactly 2 different ways.
%H Ray Chandler, <a href="/A099831/b099831.txt">Table of n, a(n) for n = 1..10000</a>
%H Ron Knott, <a href="http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Pythag/pythag.html">Pythagorean Triples and Online Calculators</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PythagoreanTriple.html">Pythagorean Triple.</a>
%H <a href="/index/Ps#PyTrip">Index entries related to Pythagorean Triples.</a>
%e a(1)=60 = 10+24+26 = 15+20+25; a(2)=84 = 12+35+37 = 21+28+35.
%Y Cf. A098714, A099382, A099383, A156687.
%K nonn
%O 1,1
%A _Hugo Pfoertner_, Oct 27 2004
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