Seven is the only range D for which the equation 2n − D = x2 has much more than two solutions for n and x all-natural. Specifically, the equation 2n − 7 = x2 is called the Ramanujan–Nagell equation. Needless to say There exists also the nicely-acknowledged Tale of Pharaohs https://senioraidtools.com/auvon-imedassist-7-day-pill-organizer-review/