Seven is the only real number D for which the equation 2n − D = x2 has a lot more than two solutions for n and x purely natural. In particular, the equation 2n − 7 = x2 is recognized as the Ramanujan–Nagell equation. Not Every person thinks that cats https://marcoqixju.blogrenanda.com/44417413/7-day-pill-organizers-an-overview