Ramanujan–Nagell Conjecture
Ramanujan-Nagell equation is an equation between a number (say, x) which is squared and another number (say, z) such that z =
Some examples are 2^3 - 7 = (1)^2, where n = 3 and x = 1 2^4 - 7 = (3)^2, where n = 4 and x = 3 2^5 - 7 = (5)^2, where n = 5 and x = 5
Triangular Mersenne numbers