Elementary number theory is the branch of number theory in which elementary methods (i.e., arithmetic, geometry, and high school algebra) are used to solve equations with integer or rational solutions. An example of a problem which can be solved using elementary number theory is the classification of all Pythagorean triples.
Elementary Number Theory
See alsoDiophantine Equation, Elementary Methods, Elementary Proof, Number Theory
This entry contributed by David Terr
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Terr, David. "Elementary Number Theory." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/ElementaryNumberTheory.html