Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #16 Jun 16 2020 13:03:14
%S 12,30,42,44,70,76,84,100,110,132,140,150,154,156,172,182,186,196,204,
%T 220,228,230,236,238,242,252,260,268,294,300,308,318,322,330,340,350,
%U 364,372,374,380,390,396,420,428,444,462,468,470,476,484,490,492,494,506,510
%N Perimeters of Heronian triangles with squarefree area.
%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>
%e a(1) = 12; there is one Heronian triangle with perimeter 12 whose area is squarefree, which is [3,4,5] with area 6.
%e a(2) = 30; there is one Heronian triangle with a perimeter of 30 whose area is squarefree, which is [5,12,13] with area 30.
%Y Cf. A330869, A334538.
%K nonn
%O 1,1
%A _Wesley Ivan Hurt_, May 05 2020