seven is the only real number D for which the equation 2n − D = x2 has greater than two answers for n and x normal. Especially, the equation 2n − seven = x2 is named the Ramanujan–Nagell equation. Jahannam has 7 gates which can be open up always. (Qur’an – Sura fifteen:forty four). Hell also has seven layers and sinners are sent to uni