seven is the one range D for which the equation 2n ? D = x2 has in excess of two solutions for n and x natural. Specifically, the equation 2n ? seven = x2 is referred to as the Ramanujan–Nagell equation.The island of Ogygia was the house of The attractive nymph named Calypso. She fell madly in love with Odysseus and promised him immortality and e… Read More