Seven is the only real number D for which the equation 2n − D = x2 has much more than two remedies for n and x all-natural. In particular, the equation 2n − seven = x2 is referred to as the Ramanujan–Nagell equation. You will find there's expanding movement of https://bathroomgrabbarsforelderl63963.suomiblog.com/facts-about-7-day-pill-organizers-revealed-53496600