7 is the sole number D for which the equation 2n − D = x2 has much more than two answers for n and x pure. Specifically, the equation 2n − seven = x2 is recognized as the Ramanujan–Nagell equation. Jahannam has 7 gates that happen to be open up always. (Qur’an – Sura fifteen:44). Hell also has 7 levels and sinners are sent to diverse l