7 is the one amount D for which the equation 2n − D = x2 has over two remedies for n and x all-natural. In particular, the equation 2n − seven = x2 is known as the Ramanujan–Nagell equation. The island of Ogygia was the house of The attractive nymph https://bathroomgrabbarsforelderl85586.atualblog.com/44272051/the-2-minute-rule-for-7-day-pill-organizers