Need help writing a function in Racket.

function pythagorean which finds pythagorean triples ( values of x, y, z where x^2 + y^2 = z ^2)

Function takes one argument which is the maximum value for c. This function should return a list of tuples (x, y, z) values.

I.E.

pythagorean 10

should return: [(3,4,5), (6,8,10)]