seven is the one quantity D for which the equation 2n ? D = x2 has much more than two methods for n and x pure. Specifically, the equation 2n ? seven = x2 is called the Ramanujan–Nagell equation.The island of Ogygia was the house of The gorgeous nymph named Calypso. She fell madly in love with Odysseus and promised him immortality and Everlasting… Read More