seven is the one amount D for which the equation 2n − D = x2 has more than two options for n and x pure. Especially, the equation 2n − seven = x2 is named the Ramanujan–Nagell equation. Jahannam has 7 gates which might be open all the time. (Qur’an – Sura fifteen:44). Hell also has 7 layers and sinners are despatched to different layer