Seven is the one variety D for which the equation 2n − D = x2 has a lot more than two options for n and x normal. Specifically, the equation 2n − 7 = x2 is known as the Ramanujan–Nagell equation. Polynices was on the list of 7 commanders. After https://emiliosywrl.life3dblog.com/36469454/the-smart-trick-of-7-day-pill-organizers-that-no-one-is-discussing