is there a quick method to find all the quadratic residues mod p where p is prime?
I know that there would be p-1/2 values but how do i find them?
It may help to know that the set of all quadratic residues $\displaystyle \mod p$ is a subgroup of index $\displaystyle 2$ of $\displaystyle \mathbb Z_p^\times,$ the multiplicative group of the integers $\displaystyle \mod p.$ I've been thinking about this recently and trying to develop a group-theoretic approach to results about quadratic residues; I'll keep you informed about further progress I make.