This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A120133 #19 Nov 14 2019 19:35:29
%S A120133 3,5,5,5,10,4,13,9,8,16,11,7,10,13,13,12,7,14,3,17,17,20,6,17,11,5,8,
%T A120133 15,25,19,15,13,12,24,16,17,25,10,29,13,25,15,9,17,18,29,15,17,13,25,
%U A120133 29,21,39,26,20,25,13,27,25,37,15,5,25,24,28,4,51,26,20,25,53,33,41,17,15,11
%N A120133 Shortest side of primitive Heronian triangles, sorted on longest side(A120131), then on middle side(A120132) and finally on shortest side.
%H A120133 Giovanni Resta, <a href="/A120133/b120133.txt">Table of n, a(n) for n = 1..10000</a>
%H A120133 Michael Somos, <a href="http://grail.eecs.csuohio.edu/~somos/tritab.html">Heronian Triangle Table</a>
%H A120133 P. Yiu, <a href="http://math.fau.edu/yiu/RecreationalMathematics2003.pdf">Heron triangles with sides < 100</a>, Recreational Mathematics, Appendix Chap. 9.3 pp. 81/360. (This is a download of 360 pages.)
%t A120133 hQ[a_,b_,c_] := IntegerQ@ Sqrt@ Block[{s = (a+b+c)/2}, s (s-a) (s-b) (s-c)]; Reap[Do[If[ GCD[a, b, c] == 1 && hQ[a, b, c], Sow@c], {a, 60}, {b, a}, {c, a-b+1, b}]][[2, 1]] (* _Giovanni Resta_, May 21 2016 *)
%Y A120133 Cf. A120131, A120132, A072294.
%K A120133 nonn
%O A120133 1,1
%A A120133 _Lekraj Beedassy_, Jun 10 2006