Seven is the only real number D for which the equation 2n − D = x2 has in excess of two alternatives for n and x natural. Specifically, the equation 2n − seven = x2 is recognized as the Ramanujan–Nagell equation. One day a monk arrived by. They invited him https://garrettsthrb.ampedpages.com/facts-about-7-day-pill-organizers-revealed-64781457