ZHANG Xiaobeng1*, LI Xiaoxue2
(1 School of Science, Xi′an University of Posts and Telecommunications,Xi′an 710121, Shaanxi, China;2 School of Mathematics, Northwest University, Xi′an 710127, Shaanxi, China)
Abstract:
Let D be a positive odd integer, and let p be an odd prime with pD. Using some results on the existence of primitive divisors of Lucas numbers, it is proved that if D≠3, then the equation x2+Dm=4pn has at most one positive integer solution (x,m,n) with m>1.
KeyWords:
generalized Ramanujan-Nagell equation; positive integer solution; number of solutions