7 is the one range D for which the equation 2n − D = x2 has more than two alternatives for n and x natural. Particularly, the equation 2n − seven = x2 is referred to as the Ramanujan–Nagell equation. Jahannam has seven gates which happen to be open all https://remingtonqlerw.ssnblog.com/36679060/how-much-you-need-to-expect-you-ll-pay-for-a-good-7-day-pill-organizers