Introduction
In 2002, J. Sandor studied two diophantine equations 3x + 3y = 6z and 4x + 18y = 22z.
After that D. Acu (2007) studied the diophantine equation of form 2x + 5y = z2. He
found that this equation has exactly two solutions in non-negative integer (x; y; z) 2
f(3; 0; 3); (2; 1; 3)g. Then A. Suvarnamani, A. Singta and S. Chotchaisthit (2011) found
solutions of two diophantine equations 4x + 7y = z2 and 4x + 11y = z2.
Now, we study the diophantine equation of form
2x + py = z2 (1);
where p is a prime number and x; y and z are non-negative integers.
2 Main Theorem
From the diophantine equation (1), we have
2x + 2y = z2 (2);
where p = 2. From the diophantine equation (2), we consider in 3 cases.
2010 Mathematics Subject Classication: 11D61.
Key words and phrases: diophantine equations, exponential equations.
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