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Let (a,b,c) be a primitive Pythagorean triple, i.e., a^{2}+b^{2}=c^{2} withgcd(a,b,c)=1, a even and b odd. Terai's conjecture says that the Diophantineequation x^{2}+b^{y}=c^{z} has only the positive integer solutions(x,y,z)=(a,2,2). In this study, we prove that Terai's conjecture is true when bis a product of two primes and c=5(mod8).

A Note on Terai's Conjecture Concerning the Exponential Diophantine Equation x^{2}+b^{y}=c^{z}