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 A120129 #16 Jan 07 2020 11:02:23 %S A120129 13,15,17,20,21,25,26,29,30,35,37,39,40,41,44,48,50,51,52,53,55,56,58, %T A120129 61,65,66,68,70,73,74,75,77,80,82,85,87,88,89,90,91,92,95,96,97,100, %U A120129 101,104,105,109,111,113,115,116,117,119,120,123,125,130,132,136,137,140,143 %N A120129 Longest side common to more than one primitive Heronian triangle. %H A120129 Ray Chandler, <a href="/A120129/b120129.txt">Table of n, a(n) for n = 1..10000</a> %H A120129 Michael Somos, <a href="http://grail.eecs.csuohio.edu/~somos/tritab.html">Heronian Triangle Table</a> %H A120129 P. Yiu, <a href="http://math.fau.edu/yiu/RecreationalMathematics2003.pdf">Heronian triangles with sides < 100</a>, Recreational Mathematics, Appendix Chap. 9.3 pp. 81/360. (This is a download of 360 pages.) %Y A120129 Cf. A120131. %K A120129 nonn %O A120129 1,1 %A A120129 _Lekraj Beedassy_, Jun 10 2006 %E A120129 Missing term 117 added by _Ray Chandler_, Jan 07 2020