Seven is the only real variety D for which the equation 2n − D = x2 has greater than two answers for n and x purely natural. Especially, the equation 2n − seven = x2 is referred to as the Ramanujan–Nagell equation. Jahannam has seven gates which might be open https://andresvibv.wikiinside.com/2817160/the_5_second_trick_for_7_day_pill_organizers