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 A098030 #31 Jan 28 2020 11:56:36
%S A098030 24,30,36,42,60
%N A098030 Areas of integer-sided triangles whose area equals their perimeter.
%C A098030 There are no further terms. Note that without the condition "integer-sided" there are other solutions, such as (9/2, 20, 41/2) which has perimeter and area 45. - _David Wasserman_, Jan 03 2008
%D A098030 S. Ainley, Mathematical Puzzles, Problem J8 p. 113, G. Bell & Sons Ltd, London (1977).
%H A098030 James Grime and Brady Haran, <a href="https://www.youtube.com/watch?v=UIjeCKPHbso">Superhero Triangles</a>, Numberphile video (2020)
%e A098030 The areas or perimeters 24, 30, 36, 42, 60 pertain respectively to triangles with sides (6, 8, 10), (5, 12, 13), (9, 10, 17), (7, 15, 20), (6, 25, 29).
%t A098030 m0 = 10 (* = initial max side *); okQ[{x_, y_, z_}] := x <= y <= z && (-x + y + z) (x + y - z) (x - y + z) (x + y + z) == 16 (x + y + z)^2; Clear[f];
%t A098030 f[m_] := f[m] = Select[Tuples[Range[m], 3], okQ]; f[m = m0]; f[m = 2 m]; While[f[m] != f[m/2], m = 2 m]; sides = f[m]; Total /@ sides // Sort (* _Jean-François Alcover_, Jul 21 2017 *)
%Y A098030 A row of the triangle in A290451.
%K A098030 fini,full,nonn
%O A098030 1,1
%A A098030 _Lekraj Beedassy_, Sep 10 2004