On the Diophantine equation x^2+7^{alpha}.11^{beta}=y^n
  In this paper, we give all the solutions of the Diophantine equation x^2+7^{alpha}.11^{beta}=y^n, in nonnegative integers x, y, n>=3 with x and y coprime, except for the case when alpha.x is odd and beta is even. 
Gokhan Soydan
math.NT