7 is the only real range D for which the equation 2n − D = x2 has greater than two solutions for n and x all-natural. Specifically, the equation 2n − seven = x2 is called the Ramanujan–Nagell equation. The island of Ogygia was the house of The attractive nymph https://senioraidtools.com/auvon-imedassist-7-day-pill-organizer-review/