7 is the one selection D for which the equation 2n − D = x2 has more than two answers for n and x normal. Especially, the equation 2n − 7 = x2 is known as the Ramanujan–Nagell equation. The Jade Emperor straight away requested many of the rivers to https://messiahgpycm.shoutmyblog.com/36769529/not-known-details-about-7-day-pill-organizers