Seven is the one selection D for which the equation 2n − D = x2 has much more than two methods for n and x natural. Particularly, the equation 2n − 7 = x2 is referred to as the Ramanujan–Nagell equation. two hours back By Mashable Staff A MacBook pro https://non-slipslippersforelderl19518.digiblogbox.com/62164798/a-review-of-7-day-pill-organizers