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Perimeters of nonprimitive Heronian triangles whose middle side length is a square.
3

%I #11 Feb 01 2021 19:23:35

%S 48,80,90,108,192,216,240,256,264,270,272,280,300,320,328,336,360,380,

%T 392,400,416,432,468,486,512,540,572,576,588,594,600,612,630,648,650,

%U 660,690,720,726,768,810,816,850,864,880,882,900,918,960,968,972,980,1008,1024,1040

%N Perimeters of nonprimitive Heronian triangles whose middle side length is a square.

%H Giovanni Resta, <a href="/A335281/b335281.txt">Table of n, a(n) for n = 1..10000</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HeronianTriangle.html">Heronian Triangle</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Heronian_triangle">Heronian triangle</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Integer_triangle">Integer Triangle</a>

%Y Cf. A010052, A335276, A335295.

%K nonn

%O 1,1

%A _Wesley Ivan Hurt_, May 30 2020