7 is the one selection D for which the equation 2n ? D = x2 has in excess of two options for n and x pure. Especially, the equation 2n ? seven = x2 is known as the Ramanujan–Nagell equation.Jahannam has 7 gates which happen to be open up all the time. (Qur’an – Sura 15:44). Hell also has seven levels and sinners are sent to unique layers In k… Read More