7 is the only number D for which the equation 2n − D = x2 has much more than two solutions for n and x normal. Particularly, the equation 2n − 7 = x2 is named the Ramanujan–Nagell equation. In contrast, whenever you click on a Microsoft-presented advert that appears https://cesarlcpcm.blogoxo.com/38159198/the-7-day-pill-organizers-diaries