7 is the sole range D for which the equation 2n − D = x2 has more than two answers for n and x normal. Specifically, the equation 2n − seven = x2 is known as the Ramanujan–Nagell equation. two hours back By Mashable Workforce A MacBook pro for $280 https://mobility-exercises-for-se32974.hamachiwiki.com/1867798/new_step_by_step_map_for_7_day_pill_organizers