7 is the only amount D for which the equation 2n − D = x2 has over two solutions for n and x pure. In particular, the equation 2n − seven = x2 is referred to as the Ramanujan–Nagell equation. We are adding far more continuously. If you will find https://cesarlcpcm.blogoxo.com/38159198/the-7-day-pill-organizers-diaries