Every Sum of Two Positive Integers Has Either a Trivial or a Non-Trivial Common Factor

Abstract: This paper investigates the arithmetic structure of exponential Diophantine equations of the form A x + B y= k n , where A, B, k, x, y, n ∈ Z + . Classical treatments such as the Beal Conjecture [1] and Fermat’s Last Theorem (FLT) [2] restrict attention to exponents greater than two, leaving open the structural behavior of the equation for n = 1 and n = 2. This manuscript provides a unified framework addressing all positive integer exponents. A central theorem establishes that each term A x , B y , and k n can be expressed as the sum of an arithmetic sequence whose number of terms and average term are positive integers, provided the equation has a trivial or non-trivial common factor. This elasticity property of k n is derived through Gauss’s method for summing arithmetic progressions. The case n = 2 recovers the classical identity for k 2 as the sum of the first k odd integers [3], revealing Pythagoras’ theorem as a special instance of the general framework. For exponents exceeding two, if gcd(A, B,k) = 1, the arithmetic structure collapses, aligning with the Beal Conjecture as it is presented in the literature as a generalization of FLT [1]. The results demonstrate a consistent theory for all positive integer exponents and show that every sum of two positive integers has either a trivial or a non-trivial common factor.