7 is the only number D for which the equation 2n − D = x2 has greater than two options for n and x natural. Specifically, the equation 2n − 7 = x2 is named the Ramanujan–Nagell equation. Jahannam has seven gates that happen to be open continually. (Qur’an – https://donalda571yof3.wikinewspaper.com/user