Show that if p=x^2+5y^2 then p must me congruent to 1 or 9 (mod 20)
B bigp0ppa1046 New member Joined Jan 30, 2007 Messages 18 Apr 9, 2007 #1 Show that if p=x^2+5y^2 then p must me congruent to 1 or 9 (mod 20)
