7 is the sole number D for which the equation 2n − D = x2 has a lot more than two remedies for n and x normal. In particular, the equation 2n − 7 = x2 is recognized as the Ramanujan–Nagell equation. One day a monk arrived by. They invited https://bathroom-grab-bars-for-el40245.blog-ezine.com/38082671/the-best-side-of-7-day-pill-organizers