7 is the only real number D for which the equation 2n − D = x2 has over two remedies for n and x purely natural. Especially, the equation 2n − seven = x2 is referred to as the Ramanujan–Nagell equation. two hrs back By Mashable Workforce A MacBook Professional https://emilianojhymr.tinyblogging.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-7-day-pill-organizers-81740823