How about or ?
and is not prime.
and [LaTeX ERROR: Convert failed] is not prime.
This is my guess , i hope that's true .
Let's say a triangle is a Heron triangle if the lengths of its three sides as well as its area
I guess : If are primes such that , then all the non-isosceles Heron triangles with as the length of one of the sides are right-angled . Therefore , we can only find out one or two possible Heron triangle(s) for it .
For example , let we have
Then the only Heron triangles are ?