7 is the only amount D for which the equation 2n − D = x2 has in excess of two remedies for n and x purely natural. Specifically, the equation 2n − 7 = x2 is called the Ramanujan–Nagell equation. Sooner or later a monk came by. They invited him https://deancdbwi.ttblogs.com/17639907/the-2-minute-rule-for-7-day-pill-organizers