OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Heronian Triangle
Wikipedia, Heronian triangle
Wikipedia, Integer Triangle
EXAMPLE
a(1) = 16; there is one primitive Heronian triangle with a perimeter of 16 whose middle side length is squarefree, which is [5,5,6].
a(4) = 36; there are two primitive Heronian triangles with a perimeter of 36 whose middle side lengths are squarefree, [10,13,13] and [9,10,17].
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, May 06 2020
STATUS
approved