Seven is the sole number D for which the equation 2n − D = x2 has a lot more than two solutions for n and x natural. Especially, the equation 2n − 7 = x2 is referred to as the Ramanujan–Nagell equation. Polynices was among the 7 commanders. Immediately after https://lukasrjxlw.ltfblog.com/36543783/considerations-to-know-about-7-day-pill-organizers