7 is the sole number D for which the equation 2n ? D = x2 has a lot more than two remedies for n and x organic. Especially, the equation 2n ? seven = x2 is called the Ramanujan–Nagell equation.The island of Ogygia was the house of The attractive nymph named Calypso. She fell madly in really like with Odysseus and promised him immortality and eter… Read More