seven is the one amount D for which the equation 2n − D = x2 has a lot more than two methods for n and x normal. Specifically, the equation 2n − 7 = x2 is recognized as the Ramanujan–Nagell equation.Jahannam has 7 gates which can be open always. (Qur’an – Sura 15:44). Hell also has 7 levels and sinners are despatched to various layers Bas