7 is the only real selection D for which the equation 2n − D = x2 has greater than two alternatives for n and x organic. Especially, the equation 2n − 7 = x2 is known as the Ramanujan–Nagell equation.Jahannam has 7 gates that happen to be open up constantly. (Qur’an – Sura 15:44). Hell also has seven levels and sinners are sent to unique