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 A334018 #31 Feb 16 2025 08:34:00 %S A334018 4,5,5,12,13,23,15,29,13,17,30,62,24,25,71,25,25,46,29,20,26,55,160, %T A334018 106,37,205,109,79,209,33,146,38,39,45,195,41,296,51,178,226,266,60, %U A334018 153,172,105,486,50,51,61,61,60,297,50,214,130,130,476,565,252,258,192,158,493 %N A334018 Sum of the middle side lengths of all primitive Heronian triangles with perimeter A096468(n). %H A334018 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HeronianTriangle.html">Heronian Triangle</a> %H A334018 Wikipedia, <a href="https://en.wikipedia.org/wiki/Heronian_triangle">Heronian triangle</a> %H A334018 Wikipedia, <a href="https://en.wikipedia.org/wiki/Integer_triangle">Integer Triangle</a> %e A334018 a(1) = 4; there is one primitive Heronian triangle with perimeter A096468(1) = 12, [3,4,5] and 4 is the middle side length. %e A334018 a(6) = 23; there are two primitive Heronian triangles with perimeter A096468(6) = 36, [9,10,17] and [10,13,13]. The sum of the middle side lengths is then 10 + 13 = 23. %Y A334018 Cf. A096468, A330874, A334120. %K A334018 nonn %O A334018 1,1 %A A334018 _Wesley Ivan Hurt_, May 16 2020