7 is the only number D for which the equation 2n − D = x2 has in excess of two remedies for n and x normal. Particularly, the equation 2n − 7 = x2 is referred to as the Ramanujan–Nagell equation. two several hours back By Mashable Staff A MacBook https://non-slip-slippers-for-eld89641.blogmazing.com/36804115/about-7-day-pill-organizers